Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 750,687	$ 124,806
Marketable securities	209,550	253,458
Prepaid expenses and other current assets	7,237	6,203
Total current assets	967,474	384,467
Property and equipment, net	50,986	46,775
Operating lease right-of-use assets	61,770	63,168
Restricted cash	2,143	2,143
Long-term marketable securities	21,627	33,731
Intangible asset	59,195	59,195
Goodwill	140,627	140,627
Other non-current assets	644	190
TOTAL ASSETS	1,304,466	730,296
Current liabilities:
Accounts payable	4,258	2,253
Accrued compensation	10,811	16,020
Accrued expenses and other current liabilities	11,171	9,466
Operating lease liabilities	3,910	3,712
Success payment liabilities	5,000
Total current liabilities	35,150	31,451
Operating lease liabilities, net of current portion	66,349	68,197
Contingent consideration	133,294	121,901
Success payment liabilities, net of current portion	187,151	76,494
Other non-current liabilities	539	540
Total liabilities	422,483	298,583
Commitments and contingencies (Note 10)
Convertible preferred stock, $0.0001 par value; zero and 537,786 shares authorized as of March 31, 2021 and December 31, 2020, respectively; zero and 134,113 shares issued and outstanding as of March 31, 2021 and December 31, 2020, respectively; aggregate liquidation preference of zero and $926,666 as of March 31, 2021 and December 31, 2020, respectively		852,897
Stockholders' equity (deficit):
Preferred stock, $0.0001 par value; 50,000 and zero shares authorized as of March 31, 2021 and December 31, 2020, respectively; zero shares issued and outstanding as of March 31, 2021 and December 31, 2020, respectively
Common stock, $0.0001 par value; 750,000 and 707,000 shares authorized as of March 31, 2021 and December 31, 2020, respectively; 178,941 and 16,170 shares issued and outstanding as of March 31, 2021 and December 31, 2020, respectively	18	2
Additional paid-in capital	1,491,958	8,216
Accumulated other comprehensive income	56	30
Accumulated deficit	(610,049)	(429,432)
Total stockholders' equity (deficit)	881,983	(421,184)
TOTAL LIABILITIES, CONVERTIBLE PREFERRED STOCK, AND STOCKHOLDERS' EQUITY (DEFICIT)	$ 1,304,466	$ 730,296