Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit
Beginning balance (shares) at Dec. 31, 2018		27,772,600
Beginning balance at Dec. 31, 2018	$ 102,862	$ 3	$ 169,784	$ (119)	$ (66,806)
Increase (Decrease) in Stockholders' Equity
Issuance of common stock upon exercise of stock options (shares)		110,156
Issuance of common stock upon exercise of stock options	255		255
Issuance of common stock (shares)		10,581
Issuance of common stock	24		24
Stock-based compensation expense	5,991		5,991
Portion of convertible note payable proceeds allocated to    beneficial conversion feature	2,101		2,101
Unrealized gain on marketable securities	222			222
Net income (loss)	(54,789)				(54,789)
Ending balance at Dec. 31, 2019	56,666	$ 3	178,155	103	(121,595)
Ending balance (shares) at Dec. 31, 2019		27,893,337
Increase (Decrease) in Stockholders' Equity
Issuance of common stock upon exercise of stock options (shares)		223,895
Issuance of common stock upon exercise of stock options	802		802
Issuance of common stock under stock purchase plan (shares)		89,172
Issuance of common stock under stock purchase plan	194		194
Issuance of common stock (shares)		11,218,593
Issuance of common stock	29,086	$ 1	29,085
Conversion of redeemable convertible preferred stock to common stock (in shares)		1,282,050
Issuance of common stock upon conversion of convertible note payable	2,000		2,000
Stock-based compensation expense	7,765		7,765
Unrealized gain on marketable securities	(103)			(103)
Net income (loss)	59,337				59,337
Ending balance at Dec. 31, 2020	$ 155,747	$ 4	218,001	0	(62,258)
Ending balance (shares) at Dec. 31, 2020	40,707,047	40,707,047
Increase (Decrease) in Stockholders' Equity
Issuance of common stock upon exercise of stock options (shares)		508,720
Issuance of common stock upon exercise of stock options	$ 2,022		2,022
Issuance of common stock upon vesting of RSUs (shares)		997,400
Issuance of common stock under stock purchase plan (shares)		46,899
Issuance of common stock under stock purchase plan	266		266
Issuance of common stock (shares)		3,737,172
Issuance of common stock	29,525	$ 1	29,524
Conversion of redeemable convertible preferred stock to common stock (in shares)		961,538
Issuance of common stock upon conversion of convertible note payable	1,500		1,500
Stock-based compensation expense	8,546		8,546
Unrealized gain on marketable securities	(221)			(221)
Net income (loss)	(78,485)				(78,485)
Ending balance at Dec. 31, 2021	$ 118,900	$ 5	$ 259,859	$ (221)	$ (140,743)
Ending balance (shares) at Dec. 31, 2021	46,958,776	46,958,776