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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Statement of Cash Flows [Abstract]      
Net income $ 36,131 $ 128,088 $ 60,578
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 28,981 17,945 12,034
Stock-based compensation 80,680 71,399 10,887
Excess tax benefit from stock-based compensation (29,348) (77,134) (323)
Deferred income taxes (11,468) (16,920) (8,129)
Accretion on investments 3,001 0 0
Other 2,426 1,865 1,224
Changes in operating assets and liabilities:      
Accounts receivable, net 38,313 (61,323) (42,453)
Inventory (35,005) (41,033) (51,583)
Prepaid expenses and other assets (23,281) (30,317) (15,355)
Accounts payable and other liabilities 68,461 98,354 135,197
Deferred revenue (1,280) 5,998 400
Net cash provided by operating activities 157,611 96,922 102,477
Investing activities:      
Purchases of property and equipment, net (51,245) (27,210) (18,325)
Purchases of marketable securities (220,055) (103,827) 0
Maturities of marketable securities 94,680 1,083 0
Sales of marketable securities 30,048 0 0
Acquisitions, net of cash acquired (65,405) (3,950) (2,912)
Net cash used in investing activities (211,977) (133,904) (21,237)
Financing activities:      
Proceeds from issuance of common stock, net 22,833 300,097 527
Repurchases of outstanding Class A common stock (35,613) 0 0
Excess tax benefit from stock-based compensation 29,348 77,134 323
Payment of deferred acquisition-related consideration 0 (2,000) 0
Payment of debt issuance costs and deferred public offering costs (903) (5,730) (1,165)
Proceeds from issuance of debt 0 0 30,000
Repayment of debt 0 (114,000) (46,000)
Net cash provided by (used in) financing activities 15,665 255,501 (16,315)
Effect of exchange rate changes on cash and cash equivalents (1,556) 0 0
Net increase (decrease) in cash and cash equivalents (40,257) 218,519 64,925
Cash and cash equivalents at beginning of period 319,929 101,410 36,485
Cash and cash equivalents at end of period 279,672 319,929 101,410
Interest paid in cash 0 1,853 4,904
Income taxes paid (refunded) in cash (1,093) 37,283 2,831
Conversion of preferred stock to common stock, net of issuance cost accretion 0 77,198 0
Purchases of property and equipment included in accounts payable and accrued liabilities 5,153 2,474 2,937
Reclass of deferred public offering costs to additional paid-in capital $ 0 $ 7,722 $ 0