Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 55,275	$ 133,583
Accounts receivable	13,126	8,676
Short-term investments and related maturity receivables	513,575	482,327
Prepaid expenses and other current assets	17,181	8,826
Total current assets	599,157	633,412
Long-term investments	11,925	100,664
Property and equipment, net	103,116	91,529
Operating lease right-of-use assets	68,493	70,720
Restricted cash	15,227	15,227
Collaboration contract assets	9,108	9,870
Other assets	33	33
Total assets	807,059	921,455
Current liabilities:
Accounts payable	8,420	8,612
Accrued expenses	40,524	42,412
CIRM award liability, current portion	3,200	3,200
Deferred revenue, current portion	33,657	21,483
Operating lease liabilities, current portion	5,717	5,577
Total current liabilities	91,518	81,284
Deferred revenue, net of current portion	17,743	27,124
CIRM award liability, net of current portion	800	800
Operating lease liabilities, net of current portion	106,587	109,241
Stock price appreciation milestones	9,928	24,168
Commitments and contingencies
Stockholders’ equity:
Preferred stock, $0.001 par value; authorized shares-5,000,000 at June 30, 2022 and December 31, 2021; Class A Convertible Preferred shares issued and outstanding-2,794,549 at June 30, 2022 and December 31, 2021	3	3
Common stock, $0.001 par value; authorized shares-250,000,000 at June 30, 2022 and December 31, 2021; issued and outstanding-96,862,797 at June 30, 2022 and 95,726,962 at December 31, 2021	97	96
Additional paid-in capital	1,494,642	1,448,584
Accumulated other comprehensive loss	(3,381)	(762)
Accumulated deficit	(910,878)	(769,083)
Total stockholders’ equity	580,483	678,838
Total liabilities and stockholders’ equity	$ 807,059	$ 921,455