Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (539,215)	$ (443,790)	$ (120,635)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	111,956	94,136	20,758
Stock-based compensation	222,119	151,852	28,858
Non-cash interest expense related to convertible senior notes	20,069	0	0
Deferred income taxes	(1,353)	(39,869)	(61,028)
Other	4,672	2,261	6,648
Changes in operating assets and liabilities, net of assets acquired and liabilities assumed in business combinations:
Accounts receivable	19,126	(97,165)	(35,145)
Inventories	(7,820)	(2,024)	(3,089)
Prepaid expenses and other assets	(675)	1,450	(17,219)
Accounts payable	7,705	(3,193)	11,504
Accrued liabilities	7,495	11,403	(18,488)
Accrued compensation	14,742	23,658	19,381
Deferred revenue	174,455	164,728	95,010
Other long-term liabilities	3,739	5,283	3,683
Net cash provided by (used in) operating activities	37,015	(131,270)	(69,762)
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisition of business, net of cash acquired	0	(55,058)	(89,240)
Purchase of property and equipment and demonstration units	(54,549)	(67,715)	(57,560)
Purchase of short-term investments	(769,097)	(390,360)	0
Maturity of short-term investments	245,116	99,541	0
Sale of short-term investments	4,807	31,577	0
Payments to Acquire Equity Method Investments	1,800	0	0
Lease deposits	(1,226)	(496)	(1,669)
Net cash used in investing activities	(576,749)	(382,511)	(148,469)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net proceeds from initial public offering	0	0	321,389
Net proceeds from follow-on public offering	0	444,338	0
Net proceeds from issuance of convertible senior notes	896,530	0	0
Prepaid forward stock purchase	(150,000)	0	0
Borrowing from line of credit	0	0	10,000
Repayment of line of credit	0	0	(20,000)
Repayment of term loan	0	0	(2,150)
Net proceeds from issuance of convertible preferred stock	0	0	9,988
Taxes for net settlement of equity awards	2,027	2,058	0
Proceeds from employee stock purchase plan	21,880	21,228	0
Proceeds from exercise of equity awards	29,090	22,718	5,428
Repayment of notes receivable from stockholders	0	0	7,294
Net cash provided by financing activities	795,473	486,226	331,949
Net change in cash and cash equivalents	255,739	(27,555)	113,718
Cash and cash equivalents, beginning of year	146,363	173,918	60,200
Cash and cash equivalents, end of year	402,102	146,363	173,918
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid for income taxes	2,686	2,489	474
Cash paid for interest	6,004	27	578
SUPPLEMENTAL DISCLOSURES OF NON-CASH INVESTING AND FINANCING ACTIVITIES:
Deferred initial public offering costs in accounts payable and accrued liabilities	0	43	412
Common stock issued in connection with acquisitions	0	1,398	791,917
Conversion of preferred stock warrants to common stock warrants	0	0	10,067
Purchases of property and equipment and demonstration units in accounts payable	$ 8,604	$ 6,716	$ 6,435