Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 76,124	$ 181,727
Marketable securities, current	233,155	189,962
Accounts receivable	5,716	4,484
Prepaid expenses and other current assets	10,694	4,836
Total current assets	325,689	381,009
Marketable securities, non-current	142,200
Property and equipment, net	3,108	3,323
Right-of-use asset	31,945	13,229
Restricted cash	3,279	2,577
Other assets	544
Total assets	506,765	400,138
Current liabilities:
Accounts payable	4,506	5,683
Accrued expenses and other current liabilities	13,606	9,524
Deferred revenue, current	31,800	27,603
Operating lease liability, current	1,334	1,042
Total current liabilities	51,246	43,852
Deferred revenue, net of current	24,368	53,617
Operating lease liability, net of current	30,777	11,826
Long-term debt—related party	10,768	10,052
Total liabilities	117,159	119,347
Commitments and contingencies (See Note 6 and Note 9)
Stockholders’ equity:
Preferred stock, par value of $0.0001 per share; 10,000,000 and no shares authorized, and no shares issued or outstanding as of December 31, 2021 and 2020, respectively
Common stock, par value of $0.0001 per share; 150,000,000 shares authorized, and 48,688,875 and 43,059,632 shares issued and outstanding as of December 31, 2021 and 2020, respectively	5	4
Additional paid-in capital	658,091	464,597
Accumulated other comprehensive (loss) income	(775)	13
Accumulated deficit	(267,715)	(183,823)
Total stockholders’ equity	389,606	280,791
Total liabilities and stockholders’ equity	$ 506,765	$ 400,138