CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenues:
Total revenues	$ 163	$ 3,480	$ 337	$ 4,165
Operating expenses:
Research and development	20,731	12,356	37,786	25,076
General and administrative	7,154	4,306	14,066	8,426
(Gain) loss on fair value remeasurement of contingent consideration	(6,326)	258	(6,862)	741
Litigation settlement related loss	15,000		15,000
Total operating expenses	36,559	16,920	59,990	34,243
Operating loss	(36,396)	(13,440)	(59,653)	(30,078)
Investment and other income, net	392	67	599	167
Net loss	(36,004)	(13,373)	(59,054)	(29,911)
Net loss	$ (36,004)	$ (13,373)	$ (59,054)	$ (29,911)
Basic net loss per common share	$ (0.77)	$ (0.34)	$ (1.26)	$ (0.76)
Diluted net loss per common share	$ (0.77)	$ (0.34)	$ (1.26)	$ (0.76)
Shares used in calculating basic net loss per share	46,759	39,616	46,749	39,615
Shares used in calculating diluted net loss per share	46,759	39,616	46,749	39,615
Comprehensive loss:
Net loss	$ (36,004)	$ (13,373)	$ (59,054)	$ (29,911)
Other comprehensive income (loss):
Unrealized (loss) gain on marketable securities	(529)	5	(2,311)	3
Comprehensive loss	(36,533)	(13,368)	(61,365)	(29,908)
Product development and licensing agreements
Revenues:
Total revenues	0	26	30	29
Contracts and grants
Revenues:
Total revenues	$ 163	$ 3,454	$ 307	$ 4,136