Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 142,745	$ 28,381
Marketable securities	342,510	161,939
Accounts receivable	2,000	2,000
Restricted cash, current	567
Prepaid expenses and other current assets	4,516	1,312
Total current assets	492,338	193,632
Property and equipment, net	4,832	3,823
Operating lease right-of-use assets	1,254	7,480
Restricted cash, net of current portion	1,712	2,279
Other assets	19	38
Total assets	500,155	207,252
Current liabilities:
Accounts payable	3,226	1,841
Accrued expenses and other current liabilities	9,887	6,140
Operating lease liabilities	1,503	959
Deferred revenue	26,022	31,977
Income tax payable	52
Total current liabilities	40,690	40,917
Operating lease liabilities, net of current portion		6,925
Deferred revenue, net of current portion	114,718	120,805
Other long-term liabilities		5
Total liabilities	155,408	168,652
Commitments and contingencies (Note 9)
Preferred stock, $0.001 par value; 10,000,000 shares authorized; no shares issued and outstanding as of December 31, 2021 and 2020, respectively	0	0
Stockholders' equity:
Common stock, $0.001 par value; 200,000,000 and 56,393,261 shares authorized at December 31, 2021 and December 31, 2020, respectively;87,598,184 and 40,372,133 shares issued and outstanding as of December 31, 2021 and 2020, respectively	88	40
Additional paid-in capital	506,760	141,644
Accumulated other comprehensive (loss) income	(765)	17
Accumulated deficit	(161,336)	(103,101)
Total stockholders' equity	344,747	38,600
Total liabilities and stockholders' equity	$ 500,155	$ 207,252