Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 48,488	$ 33,947
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	6,246	4,713
Stock-based compensation	20,047	11,487
Deferred income taxes	(2,266)	703
Provision for bad debts	481	374
Excess tax benefit on stock based-compensation	(22,975)	(459)
Amortization of investment premiums	883	0
Unrealized gain on notes receivable	0	(4,000)
Amortization of debt discount	0	527
Write-off of debt discount on notes payable	0	680
Changes in operating assets and liabilities:
Accounts receivable	(25,841)	9,678
Inventories	(22,297)	2,291
Prepaid expenses and other current assets	(20,747)	(5,621)
Other assets	(3,257)	(596)
Accounts payable	11,822	4,789
Accrued liabilities	3,082	626
Deferred revenue	57,975	2,779
Income taxes payable	21,846	372
Other liabilities	(114)	2,616
Interest payable	0	(1,630)
Interest payable—related party	0	670
Net cash provided by operating activities	73,373	63,946
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(8,768)	(8,579)
Change in restricted cash	0	4,040
Purchases of intangible assets	(705)	0
Net cash used in investing activities	(9,473)	(4,539)
CASH FLOWS FROM FINANCING ACTIVITIES:
Principal payments of lease financing obligations	(514)	(335)
Payments—deferred offering costs	(261)	0
Proceeds from issuance of common stock upon exercising options, net of repurchases	11,991	2,078
Proceeds from issuance of common stock under employee stock purchase plan	4,856	0
Excess tax benefit on stock-based compensation	22,975	459
Proceeds from initial public offering, net of issuance cost	0	241,862
Repayment on notes payable	0	(20,000)
Net cash provided by financing activities	39,047	224,064
Effect of exchange rate changes	(20)	63
NET INCREASE IN CASH AND CASH EQUIVALENTS	102,927	283,534
CASH AND CASH EQUIVALENTS—Beginning of period	240,031	113,664
CASH AND CASH EQUIVALENTS—End of period	342,958	397,198
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid for income taxes	3,501	18,433
Cash paid for interest—lease financing obligation	1,509	1,283
Cash paid for interest—notes payable	0	3,639
SUPPLEMENTAL DISCLOSURES OF NON-CASH INVESTING AND FINANCING INFORMATION:
Decrease in accounts payable and accrued liabilities related to property and equipment	(1,019)	(2,261)
Unpaid deferred offering costs	0	3,138
Acquisition of building with financing obligation	0	456
Preferred Stock
SUPPLEMENTAL DISCLOSURES OF NON-CASH INVESTING AND FINANCING INFORMATION:
Conversion of stock upon initial public offering	0	5,992
Convertible Notes Payable
SUPPLEMENTAL DISCLOSURES OF NON-CASH INVESTING AND FINANCING INFORMATION:
Conversion of stock upon initial public offering	0	66,338
Related Party Convertible Note Payable
SUPPLEMENTAL DISCLOSURES OF NON-CASH INVESTING AND FINANCING INFORMATION:
Conversion of stock upon initial public offering	$ 0	$ 30,153