CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 32,418	$ 24,027
Marketable securities	140,590	165,627
Prepaid expenses and other current assets	2,656	3,319
Total current assets	175,664	192,973
Property and equipment, net	2,629	2,741
Operating lease right-of-use assets	6,322
Other assets	2,933	2,922
Total assets	187,548	198,636
Current liabilities:
Accounts payable	1,936	1,999
Accrued expenses	8,276	6,326
Deferred revenue, current	645	1,016
Operating lease liabilities, current	1,481
Other current liabilities	22	254
Total current liabilities	12,360	9,595
Deferred rent, net of current portion		2,150
Deferred revenue, non-current	241	511
Operating lease liabilities, non-current	7,112
Total liabilities	19,713	12,256
Commitments
Stockholders' equity:
Preferred stock
Common stock	3	3
Additional paid-in capital	473,463	470,629
Accumulated other comprehensive loss	(1,117)	(206)
Accumulated deficit	(304,514)	(284,046)
Total stockholders' equity	167,835	186,380
Total liabilities and stockholders' equity	$ 187,548	$ 198,636