Consolidated Statements of Changes in Stockholders' Equity (Deficit) - USD ($) $ in Thousands	Total	Common stock	Additional paid-in capital	Accumulated deficit	Accumulated other comprehensive loss
Beginning balance (in shares) at Dec. 31, 2021		123,622,965
Beginning balance at Dec. 31, 2021	$ 22,521	$ 12	$ 457,391	$ (430,316)	$ (4,566)
Increase (Decrease) in Stockholders' Equity
Issuance of common stock under Employee Stock Purchase Plan (in shares)		81,057
Issuance of common stock under Employee Stock Purchase Plan	127		127
Issuance of common stock upon exercise of options (in shares)		11,262
Issuance of common stock upon exercise of options	21		21
Issuance of vested restricted stock units (in shares)		89,142
Issuance of vested restricted stock units	0
Issuance of common stock through at-the-market offering, net (in shares)		576,418
Issuance of common stock through at-the-market offering, net	1,675		1,675
Other financing fees	(79)		(79)
Stock-based compensation expense	2,753		2,753
Currency translation adjustment	(32)				(32)
Net (loss) income	28,778			28,778
Ending balance (in shares) at Mar. 31, 2022		124,380,844
Ending balance at Mar. 31, 2022	55,764	$ 12	461,888	(401,538)	(4,598)
Beginning balance (in shares) at Dec. 31, 2021		123,622,965
Beginning balance at Dec. 31, 2021	22,521	$ 12	457,391	(430,316)	(4,566)
Increase (Decrease) in Stockholders' Equity
Currency translation adjustment	86
Unrealized gain on marketable securities	0
Net (loss) income	37,379
Ending balance (in shares) at Jun. 30, 2022		152,713,211
Ending balance at Jun. 30, 2022	89,606	$ 15	487,008	(392,937)	(4,480)
Beginning balance (in shares) at Mar. 31, 2022		124,380,844
Beginning balance at Mar. 31, 2022	55,764	$ 12	461,888	(401,538)	(4,598)
Increase (Decrease) in Stockholders' Equity
Issuance of vested restricted stock units (in shares)		10,938
Issuance of common stock and common warrants (in shares)		27,428,572
Issuance of common stock and common warrants	21,480	$ 3	21,477
Issuance of common stock, license agreement(in shares)		892,857
Issuance of common stock, license agreement	1,000		1,000
Other financing fees	79		79
Stock-based compensation expense	2,564		2,564
Currency translation adjustment	118				118
Unrealized gain on marketable securities	0
Net (loss) income	8,601			8,601
Ending balance (in shares) at Jun. 30, 2022		152,713,211
Ending balance at Jun. 30, 2022	$ 89,606	$ 15	487,008	(392,937)	(4,480)
Beginning balance (in shares) at Dec. 31, 2022	153,042,435	153,042,435
Beginning balance at Dec. 31, 2022	$ 93,828	$ 15	493,308	(394,937)	(4,558)
Increase (Decrease) in Stockholders' Equity
Issuance of common stock under Employee Stock Purchase Plan (in shares)		108,068
Issuance of common stock under Employee Stock Purchase Plan	149		149
Issuance of vested restricted stock units (in shares)		276,480
Issuance of vested restricted stock units	0
Stock-based compensation expense	2,276		2,276
Currency translation adjustment	(22)				(22)
Unrealized gain on marketable securities	11				11
Net (loss) income	(21,663)			(21,663)
Ending balance (in shares) at Mar. 31, 2023		153,426,983
Ending balance at Mar. 31, 2023	$ 74,579	$ 15	495,733	(416,600)	(4,569)
Beginning balance (in shares) at Dec. 31, 2022	153,042,435	153,042,435
Beginning balance at Dec. 31, 2022	$ 93,828	$ 15	493,308	(394,937)	(4,558)
Increase (Decrease) in Stockholders' Equity
Currency translation adjustment	(49)
Unrealized gain on marketable securities	11
Net (loss) income	$ (33,050)
Ending balance (in shares) at Jun. 30, 2023	153,427,571	153,427,571
Ending balance at Jun. 30, 2023	$ 65,448	$ 15	498,016	(427,987)	(4,596)
Beginning balance (in shares) at Mar. 31, 2023		153,426,983
Beginning balance at Mar. 31, 2023	74,579	$ 15	495,733	(416,600)	(4,569)
Increase (Decrease) in Stockholders' Equity
Issuance of vested restricted stock units (in shares)		588
Issuance of vested restricted stock units	0
Stock-based compensation expense	2,283		2,283
Currency translation adjustment	(27)				(27)
Unrealized gain on marketable securities	0
Net (loss) income	$ (11,387)			(11,387)
Ending balance (in shares) at Jun. 30, 2023	153,427,571	153,427,571
Ending balance at Jun. 30, 2023	$ 65,448	$ 15	$ 498,016	$ (427,987)	$ (4,596)