Condensed Consolidated Statement of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2020		40,707,047
Beginning balance at Dec. 31, 2020	$ 155,747	$ 4	$ 218,001	$ 0	$ (62,258)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)		55,761
Issuance of common stock upon exercise    of stock options	148		148
Issuance of common stock under stock purchase plan (in shares)		19,377
Issuance of common stock under stock purchase plan	118		118
Issuance of common stock upon public offering, net of issuance costs (in shares)		1,677,118
Issuance of common stock upon public offering, net of issuance costs	14,716	$ 1	14,715
Issuance of common stock upon conversion of convertible note payable (in shares)		961,538
Issuance of common stock upon conversion of convertible note payable	1,500		1,500
Stock-based compensation expense	2,380		2,380
Unrealized gain (loss) on marketable securities	(1)			(1)
Net income (loss)	(15,561)				(15,561)
Ending balance (in shares) at Mar. 31, 2021		43,420,841
Ending balance at Mar. 31, 2021	$ 159,047	$ 5	236,862	(1)	(77,819)
Beginning balance (in shares) at Dec. 31, 2021	45,958,776	46,958,776
Beginning balance at Dec. 31, 2021	$ 118,900	$ 5	259,859	(221)	(140,743)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)		208
Issuance of common stock upon exercise    of stock options	0		0
Issuance of common stock under stock purchase plan (in shares)		51,329
Issuance of common stock under stock purchase plan	157		157
Issuance of common stock upon public offering, net of issuance costs (in shares)		7,337,251
Issuance of common stock upon public offering, net of issuance costs	20,556	$ 1	20,555
Stock-based compensation expense	1,865		1,865
Unrealized gain (loss) on marketable securities	(690)			(690)
Net income (loss)	$ 6,199				6,199
Ending balance (in shares) at Mar. 31, 2022	54,347,564	54,347,564
Ending balance at Mar. 31, 2022	$ 146,987	$ 6	$ 282,436	$ (911)	$ (134,544)