Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 14,842	$ 50,910
Marketable securities	41,416	73,913
Prepaid expenses and other current assets	4,330	4,317
Total current assets	60,588	129,140
Property and equipment, net	2,499	4,866
Operating lease right-of-use asset	2,919	24,307
Restricted cash	0	1,595
Other assets	0	2
Total assets	66,006	159,910
Current liabilities:
Accounts payable	609	256
Accrued expenses and other current liabilities	6,731	10,214
Operating lease liability	9,488	5,790
Total current liabilities	16,828	16,260
Operating lease liability, non-current	0	24,662
Convertible note payable, non-current	0	25,585
Total liabilities	16,828	66,507
Commitments and contingencies
Stockholders’ equity:
Preferred stock, $0.0001 par value per share; 5,000,000 shares authorized    at June 30, 2023 and December 31, 2022; no shares    issued and outstanding at June 30, 2023 and December 31, 2022	0	0
Common stock, $0.0001 par value; 150,000,000 shares    authorized at June 30, 2023 and December 31, 2022, respectively;    60,730,274 and 60,578,956 shares issued and outstanding at June 30, 2023    and December 31, 2022, respectively	6	6
Additional paid-in capital	301,655	298,741
Accumulated other comprehensive loss	(221)	(1,015)
Accumulated deficit	(252,262)	(204,329)
Total stockholders’ equity	49,178	93,403
Total liabilities and stockholders’ equity	$ 66,006	$ 159,910