Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 74,824	$ 56,045
Marketable securities	81,824	98,104
Prepaid expenses and other current assets	4,857	3,197
Total current assets	161,505	157,346
Property and equipment, net	5,198	5,651
Operating lease right-of-use asset	25,453	25,870
Restricted cash	1,595	1,595
Other assets	228	385
Total assets	193,979	190,847
Current liabilities:
Accounts payable	486	1,550
Accrued expenses and other current liabilities	10,722	13,089
Operating lease liability	5,725	5,384
Convertible note payable	2,792	0
Total current liabilities	19,725	20,023
Operating lease liability, non-current	26,019	26,909
Convertible note payable, non-current	22,519	25,015
Total liabilities	68,263	71,947
Commitments and contingencies
Stockholders’ equity:
Preferred stock, $0.0001 par value per share; 5,000,000 shares authorized    at June 30, 2022 and December 31, 2021; no shares    issued and outstanding at June 30, 2022 and December 31, 2021	0	0
Common stock, $0.0001 par value; 150,000,000 shares    authorized at June 30, 2022 and December 31, 2021, respectively;    55,384,868 and 46,958,776 shares issued and outstanding at June 30, 2022    and December 31, 2021, respectively	6	5
Additional paid-in capital	286,637	259,859
Accumulated other comprehensive loss	(1,170)	(221)
Accumulated deficit	(159,757)	(140,743)
Total stockholders’ equity	125,716	118,900
Total liabilities and stockholders’ equity	$ 193,979	$ 190,847