Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Assets
Cash and cash equivalents	$ 713,212	$ 818,150
Prepaid expenses and other current assets	8,450	6,960
Income tax receivable		22,228
Total current assets	721,662	847,338
Property and equipment, net	6,976	4,912
Other assets	3,209	5,348
Total assets	731,847	857,598
Liabilities and stockholders’ equity
Accounts payable	1,742	4,790
Accrued direct research liabilities	17,552	14,023
Other current liabilities	20,671	22,264
Payable to collaborators	78,759	73,437
Deferred revenue	2,561	4,688
Total current liabilities	121,285	119,202
Other long-term liabilities	4,819	5,511
Liability related to sale of future royalties, net	349,766	315,454
Total noncurrent liabilities	354,585	320,965
Commitments and contingencies
Stockholders’ equity:
Additional paid-in capital	1,426,187	1,375,640
Accumulated deficit	(1,170,246)	(958,245)
Total stockholders’ equity	255,977	417,431
Total liabilities and stockholders’ equity	731,847	857,598
Common Stock A
Stockholders’ equity:
Common stock value	31	31
Total stockholders’ equity	31	31
Common Stock B
Stockholders’ equity:
Common stock value	5	5
Total stockholders’ equity	$ 5	$ 5