Condensed Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit	Total
Balances at beginning at Dec. 31, 2020	$ 4	$ 492,436	$ 58	$ (250,441)	$ 242,057
Balances at beginning (in shares) at Dec. 31, 2020	36,804,603
Issuance of common stock upon exercise of options		272			272
Issuance of common stock upon exercise of options (in shares)	46,793
Issuance of common stock under the Employee Stock Purchase Plan		837			837
Issuance of common stock under the Employee Stock Purchase Plan (shares)	113,772
Stock-based compensation		12,135			12,135
Unrealized gain (loss) on available-for-sale debt securities			(64)		(64)
Net loss				(79,808)	(79,808)
Balances at end at Sep. 30, 2021	$ 4	505,680	(6)	(330,249)	175,429
Balances at end (in shares) at Sep. 30, 2021	36,965,168
Balances at beginning at Jun. 30, 2021	$ 4	501,474	16	(302,891)	198,603
Balances at beginning (in shares) at Jun. 30, 2021	36,894,414
Issuance of common stock under the Employee Stock Purchase Plan		353			353
Issuance of common stock under the Employee Stock Purchase Plan (shares)	70,754
Stock-based compensation		3,853			3,853
Unrealized gain (loss) on available-for-sale debt securities			(22)		(22)
Net loss				(27,358)	(27,358)
Balances at end at Sep. 30, 2021	$ 4	505,680	(6)	(330,249)	175,429
Balances at end (in shares) at Sep. 30, 2021	36,965,168
Balances at beginning at Dec. 31, 2021	$ 4	514,794	(102)	(359,767)	154,929
Balances at beginning (in shares) at Dec. 31, 2021	37,758,797
Issuance of common stock through "at-the-market" offering, net of underwriter discount and issuance costs		3,509			3,509
Issuance of common stock through "at-the-market" offering, net of underwriter discount and issuance costs (in shares)	700,000
Issuance of common stock upon exercise of options		76			76
Issuance of common stock upon exercise of options (in shares)	16,666
Issuance of common stock under the Employee Stock Purchase Plan		322			322
Issuance of common stock under the Employee Stock Purchase Plan (shares)	207,538
Vesting of restricted stock units (shares)	384,390
Stock-based compensation		13,708			13,708
Unrealized gain (loss) on available-for-sale debt securities			(479)		(479)
Net loss				(75,812)	(75,812)
Balances at end at Sep. 30, 2022	$ 4	532,409	(581)	(435,579)	96,253
Balances at end (in shares) at Sep. 30, 2022	39,067,391
Balances at beginning at Jun. 30, 2022	$ 4	528,380	(661)	(412,520)	115,203
Balances at beginning (in shares) at Jun. 30, 2022	38,591,436
Issuance of common stock under the Employee Stock Purchase Plan		145			145
Issuance of common stock under the Employee Stock Purchase Plan (shares)	91,565
Vesting of restricted stock units (shares)	384,390
Stock-based compensation		3,884			3,884
Unrealized gain (loss) on available-for-sale debt securities			80		80
Net loss				(23,059)	(23,059)
Balances at end at Sep. 30, 2022	$ 4	$ 532,409	$ (581)	$ (435,579)	$ 96,253
Balances at end (in shares) at Sep. 30, 2022	39,067,391