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Company Quarterly Vesting Date means March 1, May 15, August 15 and November 15 of each year."}],"balance_after":280174,"source":{"system":"sec-edgar","filing":"0001209191-20-015349","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1780060/000120919120015349/doc4.xml","form_type":"4"}},{"id":3300291,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":78562,"kind":"person","name":"Touchon Pascal","position":1,"cik":"0001780060","reported_name":"Touchon Pascal","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2020-01-28T16:31:25.000Z","date":"2020-01-24","kind":"tax_withholding","acquired":false,"shares":9900,"price":13.62,"value":134838.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Shares withheld to cover tax obligation from settlement of vested restricted stock units."}],"balance_after":130174,"source":{"system":"sec-edgar","filing":"0001209191-20-005140","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1780060/000120919120005140/doc4.xml","form_type":"4"}},{"id":3478827,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":78562,"kind":"person","name":"Touchon Pascal","position":1,"cik":"0001780060","reported_name":"Touchon Pascal","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Employee Stock Option (Right to Buy)","published_at":"2019-06-25T16:20:30.000Z","date":"2019-06-24","kind":"grant","acquired":true,"shares":225000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"25% of the shares subject to the option vest on June 24, 2020 and the remaining shares vest in equal monthly installments over the following 36 months."}],"balance_after":225000,"derivative":{"exercise_price":20.43,"expiration_date":"2029-06-24","underlying":"Common Stock","underlying_shares":225000},"source":{"system":"sec-edgar","filing":"0001209191-19-038914","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1780060/000120919119038914/doc4.xml","form_type":"4"}},{"id":3478826,"issuer":{"id":6828,"kind":"organization","name":"Atara Biotherapeutics, Inc.","symbol":"ATRA"},"owners":[{"id":78562,"kind":"person","name":"Touchon Pascal","position":1,"cik":"0001780060","reported_name":"Touchon Pascal","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2019-06-25T16:20:30.000Z","date":"2019-06-24","kind":"grant","acquired":true,"shares":140074,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"27,574 of the shares subject to restricted stock units vest in full on January 24, 2020.  28,125 of the shares subject to restricted stock units vest on June 24, 2020 and the remaining shares vest in equal annual installments over the following 3 years."}],"balance_after":140074,"source":{"system":"sec-edgar","filing":"0001209191-19-038914","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1780060/000120919119038914/doc4.xml","form_type":"4"}}]}