CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Current assets
Cash and cash equivalents	$ 280,720	$ 885,562
Short-term investments	915,789	504,544
Other current assets	81,584	13,537
Total current assets	1,278,093	1,403,643
Property and equipment, net	12,243	7,809
Long-term investment	8,947	15,629
Right-of-use asset	38,705	39,890
Other long-term assets	17,709	9,157
Total assets	1,355,697	1,476,128
Current liabilities
Accounts payable	23,869	18,117
Accrued liabilities	91,997	53,355
Deferred revenue	65,000	0
Total current liabilities	180,866	71,472
Lease liability	44,483	41,905
Other liabilities	1,428	1,962
Total liabilities	226,777	115,339
Commitments and contingencies (see Note 9)
Shareholders’ equity
Preferred stock, $0.001 par value; 10,000,000 shares authorized; none issued and outstanding at both June 30, 2021 and December 31, 2020	0	0
Common stock, $0.001 par value; 100,000,000 shares authorized; 51,608,944 and 50,439,069 issued and outstanding at June 30, 2021 and December 31, 2020, respectively	52	50
Additional paid-in capital	2,551,615	2,481,218
Accumulated other comprehensive income	9,601	9,759
Accumulated deficit	(1,432,348)	(1,130,238)
Total shareholders’ equity	1,128,920	1,360,789
Total liabilities and shareholders’ equity	$ 1,355,697	$ 1,476,128