CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenue, net	$ 2,046	$ 886	$ 3,453	$ 2,149
Costs and expenses:
Cost of revenue	1,389	994	2,658	2,201
Research and development	6,466	17,519	15,909	37,161
General and administrative	5,572	7,469	11,773	14,926
Goodwill impairment		18,504		18,504
Total costs and expenses	13,427	44,486	30,340	72,792
Loss from operations	(11,381)	(43,600)	(26,887)	(70,643)
Other income (expense), net	(189)	(85)	(11)	(315)
Loss from continuing operations	(11,570)	(43,685)	(26,898)	(70,958)
Loss from discontinued operations	(27)	(6,191)	(285)	(16,483)
Net loss	$ (11,597)	$ (49,876)	$ (27,183)	$ (87,441)
Net loss per share, basic and diluted	$ (0.28)	$ (1.21)	$ (0.65)	$ (2.12)
Weighted average common shares outstanding, basic and diluted (in shares)	42,133,646	41,274,808	41,876,037	41,261,808
Other comprehensive income (loss):
Unrealized gain (loss) on marketable securities, net of tax of $0	$ (37)	$ 30	$ 23	$ 64
Foreign currency translation adjustments	5	27	58	13
Total other comprehensive income (loss)	(32)	57	81	77
Comprehensive loss	(11,629)	(49,819)	(27,102)	(87,364)
Contract research
Revenue, net	1,853	$ 886	3,042	$ 2,149
Other revenue
Revenue, net	$ 193		$ 411