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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Cash flows from operating activities:    
Net income (loss) $ 3,991 $ (21,520)
Adjustments to reconcile to net cash provided by (used in) operating activities:    
Stock-based compensation expense 5,197 3,798
Depreciation and amortization 8,840 8,532
Income taxes 2,964 (7,261)
Change in fair value of contingent consideration 847 1,559
Excess tax benefits from stock-based compensation (5,786) (5,414)
Other 71 17
Changes in operating assets and liabilities:    
Accounts receivable 51,207 (5,225)
Inventories (11,264) (16,460)
Income taxes (4,376) (12,160)
Prepaid expenses and other assets (5,555) (249)
Accounts payable 385 1,102
Accrued expenses and other liabilities (2,045) (1,641)
Accrued compensation (8,277) (10,883)
Provision for chargebacks (278) (82)
Deferred revenue 1,874 14
Net cash provided by (used in) operating activities 37,795 (65,873)
Cash flows from investing activities:    
Purchases of property, plant and equipment (18,214) (9,082)
Net cash used in investing activities (18,214) (9,082)
Cash flows from financing activities:    
Issuance of common stock upon exercise of stock options 3,595 6,344
Excess tax benefits from stock-based compensation 5,786 5,414
Contingent obligation payments (752) (762)
Net cash provided by financing activities 8,629 10,996
Effect of exchange rate changes on cash and cash equivalents 11 (25)
Net increase (decrease) in cash and cash equivalents 28,221 (63,984)
Cash and cash equivalents at beginning of period 312,795 280,499
Cash and cash equivalents at end of period $ 341,016 $ 216,515