Condensed Statements of Stockholders’ Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Balance, beginning (in shares) at Dec. 31, 2021		42,457,471
Balance, beginning at Dec. 31, 2021	$ 142,864		$ 536,362		$ (393,498)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued upon exercises of stock options (in shares)		36,500
Shares issued upon exercises of stock options	134		134
Stock-based compensation	2,446		2,446
Net loss	(15,351)				(15,351)
Balance, ending (in shares) at Mar. 31, 2022		42,493,971
Balance, ending at Mar. 31, 2022	130,093		538,942		(408,849)
Balance, beginning (in shares) at Dec. 31, 2021		42,457,471
Balance, beginning at Dec. 31, 2021	$ 142,864		536,362		(393,498)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued upon exercises of stock options (in shares)	36,500
Unrealized gain on available-for-sale securities	$ (72)
Net loss	(31,039)
Balance, ending (in shares) at Jun. 30, 2022		42,579,852
Balance, ending at Jun. 30, 2022	116,708		541,317	$ (72)	(424,537)
Balance, beginning (in shares) at Mar. 31, 2022		42,493,971
Balance, beginning at Mar. 31, 2022	130,093		538,942		(408,849)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares under Employee Stock Purchase Plan (in shares)		75,881
Issuance of shares under Employee Stock Purchase Plan	63		63
Shares issued upon vesting of restricted stock units (in shares)		10,000
Stock-based compensation	2,312		2,312
Unrealized gain on available-for-sale securities	(72)			(72)
Net loss	(15,688)				(15,688)
Balance, ending (in shares) at Jun. 30, 2022		42,579,852
Balance, ending at Jun. 30, 2022	116,708		541,317	(72)	(424,537)
Balance, beginning (in shares) at Dec. 31, 2022		42,648,346
Balance, beginning at Dec. 31, 2022	94,331		545,407	(21)	(451,055)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued upon vesting of restricted stock units (in shares)		170,000
Stock-based compensation	1,191		1,191
Unrealized gain on available-for-sale securities	39			39
Net loss	(14,204)				(14,204)
Balance, ending (in shares) at Mar. 31, 2023		42,818,346
Balance, ending at Mar. 31, 2023	81,357		546,598	18	(465,259)
Balance, beginning (in shares) at Dec. 31, 2022		42,648,346
Balance, beginning at Dec. 31, 2022	$ 94,331		545,407	(21)	(451,055)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued upon exercises of stock options (in shares)	0
Unrealized gain on available-for-sale securities	$ 8
Net loss	(16,289)
Balance, ending (in shares) at Jun. 30, 2023		44,021,429
Balance, ending at Jun. 30, 2023	79,576		546,933	(13)	(467,344)
Balance, beginning (in shares) at Mar. 31, 2023		42,818,346
Balance, beginning at Mar. 31, 2023	81,357		546,598	18	(465,259)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued upon the exercise of pre-funded warrants (in shares)		1,180,000
Issuance of shares under Employee Stock Purchase Plan (in shares)		13,083
Issuance of shares under Employee Stock Purchase Plan	4		4
Shares issued upon vesting of restricted stock units (in shares)		10,000
Stock-based compensation	331		331
Unrealized gain on available-for-sale securities	(31)			(31)
Net loss	(2,085)				(2,085)
Balance, ending (in shares) at Jun. 30, 2023		44,021,429
Balance, ending at Jun. 30, 2023	$ 79,576		$ 546,933	$ (13)	$ (467,344)