Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 55,813	$ 28,718
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	7,366	2,505
Stock-based compensation	19,569	6,399
Deferred income taxes	(782)	(2,965)
Provision for bad debts	593	146
Unrealized gain on notes receivable	(4,000)	0
Amortization of debt discount	527	832
Write-off of debt discount on notes payable	680	0
Excess tax benefit on stock based-compensation	(841)	(340)
Changes in operating assets and liabilities:
Accounts receivable	(6,657)	(15,612)
Inventories	4,507	(30,505)
Prepaid expenses and other current assets	(8,755)	(4,370)
Other assets	(2,142)	147
Accounts payable	5,600	15,848
Accrued liabilities	7,733	10,118
Deferred revenue	18,787	22,543
Interest payable	(1,630)	3,366
Interest payable—related party	670	1,122
Income taxes payable	501	1,101
Other liabilities	1,165	1,562
Net cash provided by operating activities	98,704	40,615
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(10,789)	(15,496)
Change in restricted cash	4,040	0
Payments for (Proceeds from) Other Investing Activities	(19,451)	0
Net cash used in investing activities	(26,200)	(15,496)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from initial public offering, net of issuance cost	239,643	0
Repayment on notes payable	(20,000)	0
Principal payments of lease financing obligations	(554)	0
Proceeds from issuance of common stock upon exercising options, net of repurchases	2,578	5,914
Excess tax benefit on stock-based compensation	841	340
Net cash provided by financing activities	222,508	6,254
Effect of exchange rate changes	(80)	(8)
NET INCREASE IN CASH AND CASH EQUIVALENTS	294,932	31,365
CASH AND CASH EQUIVALENTS—Beginning of period	113,664	88,655
CASH AND CASH EQUIVALENTS—End of period	408,596	120,020
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid for income taxes	27,596	13,500
Cash paid for interest— lease financing obligation	2,048	0
Cash paid for interest— notes payable	3,639	0
SUPPLEMENTAL DISCLOSURES OF NON-CASH INVESTING AND FINANCING INFORMATION:
Increase (decrease) in accounts payable and accrued liabilities related to property and equipment	(3,634)	4,557
Unpaid deferred offering costs	740	0
Acquisition of building with financing obligation	456	17,963
Convertible Notes Payable
SUPPLEMENTAL DISCLOSURES OF NON-CASH INVESTING AND FINANCING INFORMATION:
Conversion of stock upon initial public offering	66,338	0
Convertible notes payable—related party
SUPPLEMENTAL DISCLOSURES OF NON-CASH INVESTING AND FINANCING INFORMATION:
Conversion of stock upon initial public offering	30,153	0
Convertible Preferred Stock
SUPPLEMENTAL DISCLOSURES OF NON-CASH INVESTING AND FINANCING INFORMATION:
Conversion of stock upon initial public offering	$ 5,992	$ 0