CONDENSED CONSOLIDATED STATEMENTS OF PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)
Beginning balance at Dec. 31, 2019	$ 73,121	$ 2	$ 235,049	$ (161,950)	$ 20
Beginning balance, shares at Dec. 31, 2019		21,833,037
Issuance of common stock, net of issuance costs	69,842		69,842
Issuance of common stock, net of issuance costs, shares		2,500,000
Issuance of common stock upon exercise of stock options, net of repurchase	30		30
Issuance of common stock upon exercise of stock options, net of repurchase, shares		970
Stock-based compensation	2,088		2,088
Foreign currency translation adjustment	204				204
Unrealized loss on marketable securities	(217)				(217)
Net loss	(13,139)			(13,139)
Ending balance at Mar. 31, 2020	131,929	$ 2	307,009	(175,089)	7
Ending balance, shares at Mar. 31, 2020		24,334,007
Beginning balance at Dec. 31, 2020	104,179	$ 2	319,196	(214,842)	(177)
Beginning balance, shares at Dec. 31, 2020		24,773,361
Issuance of common stock, net of issuance costs	1,180		1,180
Issuance of common stock, net of issuance costs, shares		57,100
Issuance of common stock upon exercise of stock options, net of repurchase	121		121
Issuance of common stock upon exercise of stock options, net of repurchase, shares		17,495
Issuance of common stock, upon vesting of RSU, shares		14,125
Stock-based compensation	2,687		2,687
Foreign currency translation adjustment	38				38
Unrealized loss on marketable securities	(50)				(50)
Net loss	(16,514)			(16,514)
Ending balance at Mar. 31, 2021	$ 91,641	$ 2	$ 323,184	$ (231,356)	$ (189)
Ending balance, shares at Mar. 31, 2021		24,862,081