Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 1,237,246	$ 1,337,586
Accounts receivable, net	1,790	1,599
Prepaid expenses and other current assets	16,152	13,995
Total current assets	1,255,188	1,353,180
Property and equipment, net	30,728	36,053
Operating lease right-of-use assets	41,314	0
Other assets	7,874	7,090
Total assets	1,335,104	1,396,323
Current liabilities:
Accounts payable	3,433	4,544
Amounts due to joint development partners	7,848	7,394
Accrued expenses and other current liabilities	24,640	41,698
Short-term debt	1,524	1,524
Capital lease liabilities, current	0	766
Operating lease liabilities, current	4,741	0
Total current liabilities	42,186	55,926
Capital lease liabilities, noncurrent	0	2,872
Operating lease liabilities, noncurrent	38,268	0
Long-term debt	5,166	5,543
Other liabilities	4,308	5,004
Total liabilities	89,928	69,345
Commitments and contingencies (Note 4)
Stockholders' equity:
Preferred stock, $0.0001 par value; 100,000,000 shares authorized as of December 31, 2021 and March 31, 2022; zero shares issued and outstanding as of December 31, 2021 and March 31, 2022	0	0
Common stock, $0.0001 par value; 4,876,000,000 Class A shares authorized as of December 31, 2021 and March 31, 2022; 197,833,195 and 198,992,409 Class A shares issued and outstanding as of December 31, 2021 and March 31, 2022, respectively; 24,000,000 Class B shares authorized as of December 31, 2021 and March 31, 2022; 24,000,000 Class B shares issued and outstanding as of December 31, 2021 and March 31, 2022	22	22
Additional paid-in-capital	2,494,441	2,464,730
Accumulated other comprehensive loss	276	77
Accumulated deficit	(1,249,563)	(1,137,851)
Total stockholders’ equity	1,245,176	1,326,978
Total liabilities and stockholders’ equity	$ 1,335,104	$ 1,396,323