Acquisition - Patent License Acquisition (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Business Acquisition [Line Items]
Finite-lived intangible assets	$ 16,986	$ 16,986		$ 7,600
In process research and development expensed		8,500	$ 0
Capitalized license fees	60	$ 60		$ 6,890
Minimum
Business Acquisition [Line Items]
Useful life (years)		6 years
Maximum
Business Acquisition [Line Items]
Useful life (years)		12 years
Patent and Covenant Rights | Minimum
Business Acquisition [Line Items]
Useful life (years)		6 years
Patent and Covenant Rights | Maximum
Business Acquisition [Line Items]
Useful life (years)		12 years
KeyGene Patent License Acquisition
Business Acquisition [Line Items]
Payment in connection with a license agreement	18,500
Asset acquisition, transaction costs	600
In process research and development expensed	8,500
Settlement of prior dispute between parties	1,200
Capitalized license fees	200	$ 200
KeyGene Patent License Acquisition | Patent and Covenant Rights
Business Acquisition [Line Items]
Finite-lived intangible assets	$ 9,400	$ 9,400