Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 56,045	$ 175,141
Marketable securities	98,104	0
Prepaid expenses and other current assets	3,197	5,368
Total current assets	157,346	180,509
Property and equipment, net	5,651	6,664
Operating lease right-of-use asset	25,870	27,911
Restricted cash	1,595	1,595
Other assets	385	459
Total assets	190,847	217,138
Current liabilities:
Accounts payable	1,550	1,674
Accrued expenses and other current liabilities	13,089	10,448
Operating lease liability	5,384	5,529
Total current liabilities	20,023	17,651
Operating lease liability, non-current	26,909	28,981
Convertible note payable, non-current	25,015	14,759
Total liabilities	71,947	61,391
Commitments and contingencies
Stockholders’ equity:
Preferred stock, $0.0001 par value per share; 5,000,000 shares authorized    at December 31, 2021 and December 31, 2020; no shares    issued and outstanding at December 31, 2021 and December 31, 2020	0	0
Common stock, $0.0001 par value; 150,000,000 authorized at December 31, 2021    and December 31, 2020; 46,958,776 and 40,707,047 shares issued and    outstanding at December 31, 2021 and December 31, 2020, respectively	5	4
Additional paid-in capital	259,859	218,001
Accumulated other comprehensive loss	(221)	0
Accumulated deficit	(140,743)	(62,258)
Total stockholders’ equity	118,900	155,747
Total liabilities and stockholders’ equity	$ 190,847	$ 217,138