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The Reporting Person undertakes to provide upon request by the staff of the Securities and Exchange Commission, the Issuer, or a security holder of the Issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":35089,"source":{"system":"sec-edgar","filing":"0001388658-20-000244","document":"wf-form4_160193160127859.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1388658/000138865820000244/wf-form4_160193160127859.xml","form_type":"4"}},{"id":3012609,"issuer":{"id":1499,"kind":"organization","name":"iRhythm Holdings, Inc.","symbol":"IRTC"},"owners":[{"id":93469,"kind":"person","name":"Day Mark J.","position":1,"cik":"0001769845","reported_name":"Day Mark J.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, Research & Development"}}],"security":"Common Stock","published_at":"2020-10-05T21:00:17.000Z","date":"2020-10-01","kind":"sale","acquired":false,"shares":610,"price":226.5911,"value":138220.571,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The option sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 9, 2020."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"This transaction was executed in multiple trades at prices ranging from $226.02 to $226.64 per share. The price reported above reflects the weighted average sale price. The Reporting Person undertakes to provide upon request by the staff of the Securities and Exchange Commission, the Issuer, or a security holder of the Issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":37369,"source":{"system":"sec-edgar","filing":"0001388658-20-000244","document":"wf-form4_160193160127859.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1388658/000138865820000244/wf-form4_160193160127859.xml","form_type":"4"}},{"id":3058377,"issuer":{"id":1499,"kind":"organization","name":"iRhythm Holdings, Inc.","symbol":"IRTC"},"owners":[{"id":93469,"kind":"person","name":"Day Mark J.","position":1,"cik":"0001769845","reported_name":"Day Mark J.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, Research & Development"}}],"security":"Common Stock","published_at":"2020-08-13T19:22:41.000Z","date":"2020-08-11","kind":"sale","acquired":false,"shares":243,"price":187.7,"value":45611.1,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The option sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 20, 2020."}],"balance_after":37979,"source":{"system":"sec-edgar","filing":"0001388658-20-000188","document":"wf-form4_159734654389065.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1388658/000138865820000188/wf-form4_159734654389065.xml","form_type":"4"}},{"id":3058376,"issuer":{"id":1499,"kind":"organization","name":"iRhythm Holdings, Inc.","symbol":"IRTC"},"owners":[{"id":93469,"kind":"person","name":"Day Mark J.","position":1,"cik":"0001769845","reported_name":"Day Mark J.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, Research & Development"}}],"security":"Common Stock","published_at":"2020-08-13T19:22:41.000Z","date":"2020-08-11","kind":"sale","acquired":false,"shares":40,"price":185.62,"value":7424.8,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The option sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 20, 2020."}],"balance_after":38222,"source":{"system":"sec-edgar","filing":"0001388658-20-000188","document":"wf-form4_159734654389065.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1388658/000138865820000188/wf-form4_159734654389065.xml","form_type":"4"}},{"id":3058375,"issuer":{"id":1499,"kind":"organization","name":"iRhythm Holdings, Inc.","symbol":"IRTC"},"owners":[{"id":93469,"kind":"person","name":"Day Mark J.","position":1,"cik":"0001769845","reported_name":"Day Mark J.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, Research & Development"}}],"security":"Common Stock","published_at":"2020-08-13T19:22:41.000Z","date":"2020-08-11","kind":"sale","acquired":false,"shares":360,"price":184.9636,"value":66586.896,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The option sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 20, 2020."},{"field":"price","element":"transactionPricePerShare","label":"F6","text":"This transaction was executed in multiple trades at prices ranging from $184.53 to $185.46 per share. The price reported above reflects the weighted average sale price. The Reporting Person undertakes to provide upon request by the staff of the Securities and Exchange Commission, the Issuer, or a security holder of the Issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":38262,"source":{"system":"sec-edgar","filing":"0001388658-20-000188","document":"wf-form4_159734654389065.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1388658/000138865820000188/wf-form4_159734654389065.xml","form_type":"4"}},{"id":3058374,"issuer":{"id":1499,"kind":"organization","name":"iRhythm Holdings, Inc.","symbol":"IRTC"},"owners":[{"id":93469,"kind":"person","name":"Day Mark J.","position":1,"cik":"0001769845","reported_name":"Day Mark J.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, Research & Development"}}],"security":"Common Stock","published_at":"2020-08-13T19:22:41.000Z","date":"2020-08-11","kind":"sale","acquired":false,"shares":2335,"price":183.8699,"value":429336.2165,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The option sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 20, 2020."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"This transaction was executed in multiple trades at prices ranging from $183.42 to $184.33 per share. The price reported above reflects the weighted average sale price. The Reporting Person undertakes to provide upon request by the staff of the Securities and Exchange Commission, the Issuer, or a security holder of the Issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":38622,"source":{"system":"sec-edgar","filing":"0001388658-20-000188","document":"wf-form4_159734654389065.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1388658/000138865820000188/wf-form4_159734654389065.xml","form_type":"4"}},{"id":3058373,"issuer":{"id":1499,"kind":"organization","name":"iRhythm Holdings, Inc.","symbol":"IRTC"},"owners":[{"id":93469,"kind":"person","name":"Day Mark J.","position":1,"cik":"0001769845","reported_name":"Day Mark J.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, Research & Development"}}],"security":"Common Stock","published_at":"2020-08-13T19:22:41.000Z","date":"2020-08-11","kind":"sale","acquired":false,"shares":1586,"price":182.9621,"value":290177.8906,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The option sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 20, 2020."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"This transaction was executed in multiple trades at prices ranging from $182.40 to $183.29 per share. The price reported above reflects the weighted average sale price. The Reporting Person undertakes to provide upon request by the staff of the Securities and Exchange Commission, the Issuer, or a security holder of the Issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":40957,"source":{"system":"sec-edgar","filing":"0001388658-20-000188","document":"wf-form4_159734654389065.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1388658/000138865820000188/wf-form4_159734654389065.xml","form_type":"4"}},{"id":3058372,"issuer":{"id":1499,"kind":"organization","name":"iRhythm Holdings, Inc.","symbol":"IRTC"},"owners":[{"id":93469,"kind":"person","name":"Day Mark J.","position":1,"cik":"0001769845","reported_name":"Day Mark J.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, Research & Development"}}],"security":"Common Stock","published_at":"2020-08-13T19:22:41.000Z","date":"2020-08-11","kind":"sale","acquired":false,"shares":436,"price":181.6291,"value":79190.2876,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The option sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 20, 2020."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"This transaction was executed in multiple trades at prices ranging from $181.08 to $181.97 per share. The price reported above reflects the weighted average sale price. The Reporting Person undertakes to provide upon request by the staff of the Securities and Exchange Commission, the Issuer, or a security holder of the Issuer, full information regarding the number of shares sold at each separate price."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 302 shares acquired under the Issuer's employee stock purchase plan on May 29, 2020."}],"balance_after":42543,"source":{"system":"sec-edgar","filing":"0001388658-20-000188","document":"wf-form4_159734654389065.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1388658/000138865820000188/wf-form4_159734654389065.xml","form_type":"4"}},{"id":3231125,"issuer":{"id":1499,"kind":"organization","name":"iRhythm Holdings, Inc.","symbol":"IRTC"},"owners":[{"id":93469,"kind":"person","name":"Day Mark J.","position":1,"cik":"0001769845","reported_name":"Day Mark 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are represented by restricted stock units (\"RSUs\"), each of which represents a contingent right to receive one share of IRTC common stock.  50% of the RSUs vest on February 25, 2022, and 25% on each one-year anniversary thereafter."}],"balance_after":44477,"source":{"system":"sec-edgar","filing":"0001388658-20-000026","document":"wf-form4_158285491839936.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1388658/000138865820000026/wf-form4_158285491839936.xml","form_type":"4"}},{"id":3321834,"issuer":{"id":1499,"kind":"organization","name":"iRhythm Holdings, Inc.","symbol":"IRTC"},"owners":[{"id":93469,"kind":"person","name":"Day Mark J.","position":1,"cik":"0001769845","reported_name":"Day Mark J.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, Research & Development"}}],"security":"Employee Stock Option (right to 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