CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock.	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit	Total
Balance at Dec. 31, 2019	$ 3	$ 288,224	$ 29	$ (217,145)	$ 71,111
Balance (in shares) at Dec. 31, 2019	27,953,233
Issuance of common stock in connection with at-the-market offering, net		1,222			1,222
Issuance of common stock in connection with at-the-market offering, net (Shares)	(310,734)
Common stock issued on exercise of stock options		88			88
Common stock issued on exercise of stock options (in shares)	108,667
Stock-based compensation expense		5,747			5,747
Unrealized gain (loss) on marketable securities			(25)		(25)
Net loss				(5,995)	(5,995)
Balance at Dec. 31, 2020	$ 3	295,281	4	(223,140)	72,148
Balance (in shares) at Dec. 31, 2020	28,372,634
Issuance of common stock in connection with at-the-market offering, net	$ 1	28,953			28,954
Issuance of common stock in connection with at-the-market offering, net (Shares)	6,609,605
Common stock issued on exercise of stock options		1,215			1,215
Common stock issued on exercise of stock options (in shares)	329,665
Issuance of common stock upon exercise of Exchange Warrants (Shares)	1,457,947
Issuance of common stock upon follow-on public offering, net	$ 1	31,988			31,989
Issuance of common stock upon follow-on public offering, net (Shares)	9,783,660
Stock-based compensation expense		4,232			4,232
Unrealized gain (loss) on marketable securities			(7)		(7)
Foreign currency translation adjustment			1,872		1,872
Net loss				(43,241)	(43,241)
Balance at Dec. 31, 2021	$ 5	361,669	1,869	(266,381)	97,162
Balance (in shares) at Dec. 31, 2021	46,553,511
Stock-based compensation expense		2,692			2,692
Unrealized gain (loss) on marketable securities			(48)		(48)
Foreign currency translation adjustment			(2,384)		(2,384)
Net loss				(41,307)	(41,307)
Balance at Dec. 31, 2022	$ 5	$ 364,361	$ (563)	$ (307,688)	$ 56,115
Balance (in shares) at Dec. 31, 2022	46,553,511