CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Total revenue	$ 1,824	$ 2,046	$ 3,601	$ 3,453
Costs and expenses:
Cost of revenue	1,263	1,389	2,465	2,658
Research and development	7,897	6,466	15,735	14,142
General and administrative	5,870	5,572	10,697	11,773
Revaluation of contingent consideration	4,800		21,239	1,767
Total costs and expenses	19,830	13,427	50,136	30,340
Loss from operations	(18,006)	(11,381)	(46,535)	(26,887)
Other expense, net	(155)	(189)	(380)	(11)
Loss from continuing operations	(18,161)	(11,570)	(46,915)	(26,898)
Loss from discontinued operations		(27)		(285)
Net loss	$ (18,161)	$ (11,597)	$ (46,915)	$ (27,183)
Net loss per share, basic and diluted	$ (0.34)	$ (0.28)	$ (0.90)	$ (0.65)
Weighted average common shares outstanding, basic and diluted	53,968,405	42,133,646	52,163,136	41,876,037
Other comprehensive income (loss):
Unrealized gain (loss) on marketable securities, net of tax of $0	$ 25	$ (37)	$ (10)	$ 23
Foreign currency translation adjustment	(69)	5	(80)	58
Total other comprehensive income (loss)	(44)	(32)	(90)	81
Comprehensive loss	(18,205)	(11,629)	(47,005)	(27,102)
Contract research
Total revenue	1,606	1,853	3,141	3,042
Other revenue
Total revenue	$ 218	$ 193	$ 460	$ 411