Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current assets
Cash and cash equivalents	$ 228,387	$ 338,426
Marketable securities	111,473	137,314
Accounts receivable, net	46,017	42,999
Prepaid expenses	18,401	10,505
Other current assets	5,886	1,953
Total current assets	410,164	531,197
Marketable securities	193,640	46,809
Accounts receivable, net	2,730	3,267
Property and equipment, net	122,231	56,467
Operating lease right-of-use assets	61,742	63,815
Restricted cash	1,330	1,330
Other assets	8,558	5,279
Total assets	800,395	708,164
Current liabilities
Accounts payable	19,845	10,622
Accrued expenses and other current liabilities	49,694	49,082
Deferred revenue	395	449
Operating lease liabilities	1,329	2,500
Liability related to sale of future royalties	35,508	18,794
Total current liabilities	106,771	81,447
Deferred revenue	3,531	3,783
Operating lease liabilities	83,880	70,153
Liability related to sale of future royalties	144,315	174,504
Other liabilities	484	524
Total liabilities	338,981	330,411
Stockholders’ equity
Preferred stock; $0.0001 par value; 10,000 shares authorized, and no shares issued and outstanding at September 30, 2021 and December 31, 2020
Common stock; $0.0001 par value; 100,000 shares authorized at March 31, 2020 and December 31, 2019; 37,190 and 36,992 shares issued and outstanding at March 31, 2020 and December 31, 2019, respectively	4	4
Additional paid-in capital	917,950	667,181
Accumulated other comprehensive loss	(1,285)	(360)
Accumulated deficit	(455,255)	(289,072)
Total stockholders’ equity	461,414	377,753
Total liabilities and stockholders’ equity	$ 800,395	$ 708,164