CONSOLIDATED AND CONDENSED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 529,452	$ 558,960
Short-term investments	45,934	61,032
Accounts receivable, net of allowance of $6,711 and $7,000 at June 30, 2018 and December 31, 2017, respectively	34,823	37,948
Inventories	30,710	28,042
Prepaid expenses and other current assets	153,042	130,838
Total current assets	793,961	816,820
Property and equipment, net	468,422	361,141
Goodwill and intangible assets, net	2,918	3,105
Long-term investments	9,767	21,561
Other noncurrent assets	12,200	10,776
Total assets	1,287,268	1,213,403
Current liabilities
Accounts payable	543,596	440,366
Accrued expenses	129,458	120,247
Deferred revenue	121,618	94,116
Other current liabilities	95,626	85,026
Total current liabilities	890,298	739,755
Lease financing obligation, net of current portion	141,025	82,580
Long-term debt	342,281	332,905
Other liabilities	109,142	106,492
Total liabilities	1,482,746	1,261,732
Commitments and contingencies (Note 6)
Convertible preferred stock, $0.001 par value per share: 10,000,000 shares authorized and none issued at June 30, 2018 and December 31, 2017	0	0
Additional paid-in capital	593,460	537,212
Accumulated deficit	(787,118)	(583,266)
Accumulated other comprehensive (loss)	(1,909)	(2,363)
Total stockholders’ equity	(195,478)	(48,329)
Total liabilities and stockholders’ equity	1,287,268	1,213,403
Class A common stock
Common stock	59	57
Class B common stock
Common stock	$ 30	$ 31