Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 59,028	$ 131,650
Marketable securities	69,256	45,276
Prepaid expenses and other current assets	3,813	3,767
Total current assets	132,097	180,693
Restricted cash	1,780	1,780
Operating lease, right-of-use asset	23,930	0
Property and equipment, net	6,316	7,461
Total assets	164,123	189,934
Current liabilities:
Accounts payable	2,578	3,040
Accrued expenses and other current liabilities	6,722	7,823
Operating lease liability, current portion	3,621	0
Total current liabilities	12,921	10,863
Operating lease liability, net of current portion	27,177	0
Deferred rent	0	6,399
Total liabilities	40,098	17,262
Commitments and contingencies (Note 7)
Stockholders' Equity:
Preferred stock, $0.001 par value; 10,000,000 shares authorized; no shares issued or outstanding	0	0
Common stock, $0.001 par value; 150,000,000 shares authorized; 60,555,520 and 58,799,157 shares issued and outstanding as of September 30, 2022 and December 31, 2021, respectively	61	59
Additional paid-in capital	506,277	498,210
Accumulated other comprehensive loss	(462)	(30)
Accumulated deficit	(381,851)	(325,567)
Total stockholders' equity	124,025	172,672
Total liabilities and stockholders' equity	$ 164,123	$ 189,934