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License and Collaboration Agreement (Tables) | 12 Months Ended
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Dec. 31, 2020
License and Collaboration Agreement. |
Schedule of changes in contract assets and liabilities | The following table presents changes in the Company’s contract assets and liabilities during the periods presented (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Balance at | ​ | ​ | ​ | ​ | ​ | Balance at
​ | ​ | Beginning of | ​ | ​ | ​ | ​ | ​ | End of
Year Ended December 31, 2020 |  | Period | ​ | Additions |  | Deductions |  | Period
Contract assets: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Receivable from collaboration partner - related party | ​ | $ | 5,955 | ​ | $ | 6,221 | ​ | $ | (9,750) | ​ | $ | 2,426
Contract asset - related party | ​ | $ | 800 | ​ | $ | 342 | ​ | $ | (1,142) | ​ | $ | —
Contract liabilities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Deferred revenue - related party | ​ | $ | 41,530 | ​ | $ | 3,963 | ​ | $ | (31,016) | ​ | $ | 14,477
Payable to collaboration partner - related party | ​ | $ | 1,262 | ​ | $ | 3,800 | ​ | $ | (2,330) | ​ | $ | 2,732
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Balance at | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Balance at
​ | ​ | Beginning of | ​ | ​ | ​ | ​ | ​ | End of
Year Ended December 31, 2019 |  | Period | ​ | Additions |  | Deductions |  | Period
Contract assets: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Receivable from collaboration partner - related party | ​ | $ | 2,042 | ​ | $ | 36,837 | ​ | $ | (32,924) | ​ | $ | 5,955
Contract asset - related party | ​ | $ | 2,545 | ​ | $ | 800 | ​ | $ | (2,545) | ​ | $ | 800
Contract liabilities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Deferred revenue - related party | ​ | $ | 8,223 | ​ | $ | 42,456 | ​ | $ | (9,149) | ​ | $ | 41,530
Payable to collaboration partner - related party | ​ | $ | 1,061 | ​ | $ | 1,468 | ​ | $ | (1,267) | ​ | $ | 1,262

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- Definition Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130551-203045 + Details
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