Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current assets
Cash and cash equivalents	$ 764,375	$ 850,117
Unbilled other receivable		5,815
Prepaid expenses and other current assets	8,028	7,545
Total current assets	772,403	863,477
Property and equipment, net	23	48
Other assets	466	107
Total assets	772,892	863,632
Current liabilities
Accounts payable	4,534	60
Accrued expenses and other current liabilities	52,349	14,368
Deferred revenue		301,367
Total current liabilities	56,883	315,795
Other liabilities	5,932	36
Total liabilities	62,815	315,831
Commitments and contingencies (see Note 7)
Stockholders’ equity:
Preferred stock, $0.001 par value per share; 10,000,000 shares authorized; no shares issued and outstanding as of December 31, 2021 and 2020
Common stock, $0.001 par value; 300,000,000 shares authorized; 83,102,730 and 82,436,937 shares issued and outstanding as of December 31, 2021 and 2020	83	82
Additional paid-in capital	653,964	612,879
Retained earnings (accumulated deficit)	56,030	(65,160)
Total stockholders’ equity	710,077	547,801
Total liabilities and stockholders’ equity	$ 772,892	$ 863,632