Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Private Placement	Common Stock	Common Stock Private Placement	Treasury Stock	Additional Paid-In Capital	Additional Paid-In Capital Private Placement	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Beginning balance at Dec. 31, 2020	$ 95,181		$ 28			$ 316,775		$ (2)	$ (221,620)
Beginning balance, Shares at Dec. 31, 2020			27,941,566
Issuance of common stock in connection with public offering, net of issuance costs		$ 47,407		$ 5			$ 47,402
Issuance of common stock in connection with public offering, net of issuance costs, Shares				4,600,000
Issuance of common stock under employee benefit plans	93					93
Issuance of common stock under employee benefit plans, Shares			11,888
Vesting of restricted stock awards	1					1
Vesting of restricted stock awards, Shares			40,982
Repurchase of unvested restricted stock awards					1,836
Retirement of treasury shares					(1,836)
Stock-based compensation expense	2,073					2,073
Unrealized loss on marketable securities	(2)							(2)
Net loss	(16,999)								(16,999)
Ending balance at Mar. 31, 2021	127,754		$ 33			366,344		(4)	(238,619)
Ending balance, Shares at Mar. 31, 2021			32,594,436
Beginning balance at Dec. 31, 2020	95,181		$ 28			316,775		(2)	(221,620)
Beginning balance, Shares at Dec. 31, 2020			27,941,566
Ending balance at Dec. 31, 2021	211,539		$ 41			514,362		(397)	(302,467)
Ending balance, Shares at Dec. 31, 2021			40,626,224
Issuance of common stock under employee benefit plans	395					395
Issuance of common stock under employee benefit plans, Shares			47,627
Vesting of restricted stock awards, Shares			9,754
Stock-based compensation expense	3,847					3,847
Unrealized loss on marketable securities	(693)							(693)
Net loss	(25,928)								(25,928)
Ending balance at Mar. 31, 2022	$ 189,160		$ 41			$ 518,604		$ (1,090)	$ (328,395)
Ending balance, Shares at Mar. 31, 2022			40,683,605