Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current Assets:
Cash and cash equivalents	$ 123,406	$ 160,020
Marketable securities	625,282	437,351
Accounts receivable	2,031	2,130
Prepaid expenses and other current assets	18,584	17,016
Total current assets	769,303	616,517
Marketable securities - noncurrent	337,361	0
Property and equipment, net	20,968	15,943
Operating lease right-of-use assets	79,143	39,114
Equity method investment	58,131	0
Investments and other assets	29,558	4,748
Total Assets	1,294,464	676,322
Current Liabilities:
Accounts payable	9,653	10,460
Accrued expenses	43,309	25,554
Current portion of operating lease liability	9,112	5,696
Current portion of deferred revenue ($41.2 million and $0 million from related party)	63,759	22,544
Total current liabilities	125,833	64,254
Deferred revenue, net of current portion ($19.9 million and $0 million from related party)	63,476	51,387
Long-term operating lease liability	64,911	33,609
Commitments and contingencies (Note 8)
Stockholders’ Equity:
Common stock, $0.0001 par value; 120,000,000 shares authorized; 74,485,883 and 66,234,056 shares issued and outstanding at December 31, 2021 and 2020, respectively	7	7
Additional paid-in capital	1,745,870	962,173
Accumulated other comprehensive income	(2,632)	1
Accumulated deficit	(703,001)	(435,109)
Total stockholders’ equity	1,040,244	527,072
Total Liabilities and Stockholders’ Equity	$ 1,294,464	$ 676,322