Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Current Assets:
Cash and cash equivalents	$ 171,806	$ 523,506
Marketable securities	736,268	669,116
Accounts receivable ($0 and $0.3 million, respectively, from related party)	5,056	3,768
Prepaid expenses and other current assets	26,485	20,407
Total current assets	939,615	1,216,797
Marketable securities - noncurrent	164,013	69,338
Property and equipment, net	33,194	27,921
Operating lease right-of-use assets	123,550	133,076
Equity method investment	21,837	32,455
Investments and other assets	41,031	40,527
Total Assets	1,323,240	1,520,114
Current Liabilities:
Accounts payable	11,634	5,154
Accrued expenses ($1.4 million and $1.6 million, respectively, from related party)	49,534	60,876
Current portion of operating lease liability	16,750	16,685
Current portion of deferred revenue ($2.9 million and $19.9 million, respectively, from related party)	21,933	43,839
Total current liabilities	99,851	126,554
Deferred revenue, net of current portion	12,919	19,932
Long-term operating lease liability	105,582	114,018
Contingent consideration liability	0	24,026
Commitments and contingencies (Note 6)
Stockholders’ Equity:
Common stock, $0.0001 par value; 240,000,000 and 120,000,000 shares authorized at June 30, 2023 and December 31, 2022, respectively; 88,347,634 and 87,103,007 shares issued and outstanding at June 30, 2023 and December 31, 2022, respectively	9	9
Additional paid-in capital	2,512,741	2,420,223
Accumulated other comprehensive loss	(3,868)	(7,461)
Accumulated deficit	(1,403,994)	(1,177,187)
Total stockholders’ equity	1,104,888	1,235,584
Total Liabilities and Stockholders’ Equity	$ 1,323,240	$ 1,520,114