Condensed Consolidated Statements of Convertible Preferred Stock and Stockholders (Deficit) Equity (Unaudited) - USD ($) $ in Thousands	Total	Convertible Preferred Stock	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income	Accumulated Deficit
Beginning balance at Dec. 31, 2019	$ (19,723)			$ 1,364		$ (21,087)
Temporary equity, beginning balance, shares at Dec. 31, 2019		2,617,386
Temporary equity, beginning balance at Dec. 31, 2019		$ 17,051
Beginning balance, shares at Dec. 31, 2019			3,641,449
Issuance of common stock upon exercise of common stock options	176			176
Issuance of common stock upon exercise of common stock options, shares			220,043
Stock-based compensation	58			58
Net loss	(1,805)					(1,805)
Ending balance at Mar. 31, 2020	(21,294)			1,598		(22,892)
Temporary equity, ending balance, shares at Mar. 31, 2020		2,617,386
Temporary equity, ending balance at Mar. 31, 2020		$ 17,051
Ending balance, shares at Mar. 31, 2020			3,861,492
Beginning balance at Dec. 31, 2020	$ 274,282		$ 3	315,288	$ 33	(41,042)
Beginning balance, shares at Dec. 31, 2020			32,485,784
Issuance of common stock upon exercise of common stock options, shares	62,951
Issuance of common stock upon exercise of common stock options and vesting of restricted stock units	$ 70			70
Issuance of common stock upon exercise of common stock options and vesting of restricted stock units, Shares			64,527
Proceeds from follow-on public offering, net of underwriters' discounts and commissions and issuance costs	96,762		$ 1	96,761
Proceeds from follow-on public offering, net of underwriters' discounts and commissions and issuance costs, Shares			4,600,000
Stock-based compensation	974			974
Other comprehensive income	(5)				(5)
Net loss	(8,866)					(8,866)
Ending balance at Mar. 31, 2021	$ 363,217		$ 4	$ 413,093	$ 28	$ (49,908)
Ending balance, shares at Mar. 31, 2021			37,150,311