Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Balance at Dec. 31, 2020	$ 76,069	$ 22	$ 390,803	$ 5	$ (314,761)
Balance (in shares) at Dec. 31, 2020		22,097,820
Stock-based compensation expense	1,026		1,026
Stock-based compensation expense		10,149
Issuance of common stock for public offering, net of issuance costs	49,250	$ 9	49,241
Issuance of common stock for public offering, net of issuance costs, shares		9,185,000
Issuance of common stock from stock grants	182		182
Issuance of common stock from stock grants, shares		38,058
Net loss	(22,438)				(22,438)
Balance at Mar. 31, 2021	104,089	$ 31	441,252	$ 5	(337,199)
Balance (in shares) at Mar. 31, 2021		31,331,027
Balance at Dec. 31, 2021	41,089	$ 31	443,752		(402,694)
Balance (in shares) at Dec. 31, 2021		31,409,707
Stock-based compensation expense	515		515
Stock-based compensation expense		32,684
Issuance of common stock from stock grants	16		16
Issuance of common stock from stock grants, shares		34,662
Net loss	(14,536)				(14,536)
Balance at Mar. 31, 2022	$ 27,084	$ 31	$ 444,283		$ (417,230)
Balance (in shares) at Mar. 31, 2022		31,477,053