CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current assets
Cash and cash equivalents	$ 242,624	$ 885,562
Short-term investments	911,794	504,544
Other current assets	17,476	13,537
Total current assets	1,171,894	1,403,643
Property and equipment, net	13,736	7,809
Long-term investment	11,253	15,629
Right-of-use asset	38,172	39,890
Other long-term assets	18,375	9,157
Total assets	1,253,430	1,476,128
Current liabilities
Accounts payable	42,923	18,117
Accrued liabilities	79,156	53,355
Total current liabilities	122,079	71,472
Lease liability	45,520	41,905
Other liabilities	1,806	1,962
Total liabilities	169,405	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 September 30, 2021 and December 31, 2020	0	0
Common stock, $0.001 par value; 100,000,000 shares authorized; 51,767,083 and 50,439,069 issued and outstanding at September 30, 2021 and December 31, 2020, respectively	52	50
Additional paid-in capital	2,586,780	2,481,218
Accumulated other comprehensive income	9,595	9,759
Accumulated deficit	(1,512,402)	(1,130,238)
Total shareholders’ equity	1,084,025	1,360,789
Total liabilities and shareholders’ equity	$ 1,253,430	$ 1,476,128