CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 235,876	$ 658,364
Investments	867,124	863,063
Accounts receivable	5,032	11,686
Accounts receivable from related party (Note 14)	337	899
Prepaid expenses and other current assets	19,403	28,399
Restricted cash	1,032	595
Total current assets	1,128,804	1,563,006
Investments, non-current	159,987	172,990
Property and equipment, net	201,495
Property and equipment, net		211,977
Right-of-use assets, operating leases	86,414
Restricted cash, non-current	10,791	11,532
Other non-current assets	1,931	2,644
Total assets	1,589,422	1,962,149
Current liabilities:
Accounts payable	7,090	31,210
Accrued liabilities	67,652	79,073
Deferred revenue	63,310	109,056
Other current liabilities	5,063	3,464
Total current liabilities	143,115	222,803
Deferred revenue, non-current	138,995	165,352
Operating lease liabilities, non-current	93,675
Financing lease liabilities, non-current	38,689
Deferred lease obligation, non-current		10,006
Lease financing obligation		33,489
Other non-current liabilities	138	258
Total liabilities	414,612	431,908
Commitments and contingencies (Note 8)
Stockholders’ equity:
Preferred stock, $0.0001 par value; 162,000,000 shares authorized at December 31, 2019 and 2018; 0 shares issued or outstanding at December 31, 2019 and 2018	0	0
Common stock, par value $0.0001; 1,600,000,000 shares authorized as of December 31, 2019 and 2018; 336,536,985 and 328,798,904 shares issued and outstanding as of December 31, 2019 and 2018, respectively	34	33
Additional paid-in capital	2,669,426	2,538,155
Accumulated other comprehensive gain (loss)	1,804	(1,320)
Accumulated deficit	(1,496,454)	(1,006,627)
Total stockholders’ equity	1,174,810	1,530,241
Total liabilities and stockholders’ equity	$ 1,589,422	$ 1,962,149