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Agreements - Gilead (Details) $ in Thousands		12 Months Ended
	Dec. 19, 2018 item	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Agreements
Revenue earned		$ 15,403	$ 20,492
Accounts receivable			25,000
Gilead
Agreements
Number of programs | item	3
Option exercise period	90 days
Revenue proceeds			25,000
Revenue earned		$ 15,400	$ 20,500

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