CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 362,613	$ 389,275
Marketable securities, short-term	316,454	250,981
Accounts receivable, net of allowance for doubtful accounts and returns of $5,843 and $4,310, respectively	321,328	247,415
Inventories	36,941	27,131
Prepaid expenses and other current assets	63,667	38,176
Total current assets	1,101,003	952,978
Marketable securities, long-term	58,842	59,783
Property, plant and equipment, net	295,901	175,167
Equity method investments	52,875	45,061
Goodwill and intangible assets, net	90,070	81,998
Deferred tax assets	73,532	67,844
Other assets	25,400	13,320
Total assets	1,697,623	1,396,151
Current liabilities:
Accounts payable	45,942	28,596
Accrued liabilities	173,851	134,332
Deferred revenues	241,576	191,407
Total current liabilities	461,369	354,335
Income tax payable	45,375	45,133
Other long-term liabilities	8,921	1,294
Total liabilities	515,665	400,762
Commitments and contingencies (Note 8 and 9)
Stockholders' equity:
Preferred stock, $0.0001 par value (5,000 shares authorized; none issued)	0	0
Common stock, $0.0001 par value (200,000 shares authorized; 80,176 and 79,553 issued and outstanding, respectively)	8	8
Additional paid-in capital	880,045	864,871
Accumulated other comprehensive income (loss), net	788	(938)
Retained earnings	301,117	131,448
Total stockholders’ equity	1,181,958	995,389
Total liabilities and stockholders’ equity	$ 1,697,623	$ 1,396,151