Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 28,982	$ 50,910
Marketable securities	73,073	73,913
Prepaid expenses and other current assets	5,154	4,317
Total current assets	107,209	129,140
Property and equipment, net	4,511	4,866
Operating lease right-of-use asset	23,693	24,307
Restricted cash	1,595	1,595
Other assets	0	2
Total assets	137,008	159,910
Current liabilities:
Accounts payable	1,108	256
Accrued expenses and other current liabilities	4,612	10,214
Operating lease liability	5,811	5,790
Convertible note payable	3,219	0
Total current liabilities	14,750	16,260
Operating lease liability, non-current	23,939	24,662
Convertible note payable, non-current	22,488	25,585
Total liabilities	61,177	66,507
Commitments and contingencies
Stockholders’ equity:
Preferred stock, $0.0001 par value per share; 5,000,000 shares authorized    at March 31, 2023 and December 31, 2022; no shares    issued and outstanding at March 31, 2023 and December 31, 2022	0	0
Common stock, $0.0001 par value; 150,000,000 shares    authorized at March 31, 2023 and December 31, 2022, respectively;    60,716,873 and 60,578,956 shares issued and outstanding at March 31, 2023    and December 31, 2022, respectively	6	6
Additional paid-in capital	300,464	298,741
Accumulated other comprehensive loss	(569)	(1,015)
Accumulated deficit	(224,070)	(204,329)
Total stockholders’ equity	75,831	93,403
Total liabilities and stockholders’ equity	$ 137,008	$ 159,910