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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cash flows from operating activities:    
Net income (loss) from continuing operations $ (4,908) $ 10,485
Adjustments to reconcile to net cash provided by (used in) operating activities:    
Stock-based compensation expense 7,255 4,284
Depreciation and amortization 12,373 10,166
Income taxes (4,468) 4,299
Change in fair value of contingent obligations 989 200
Impairment of equipment charge 34 0
Other 102 87
Changes in operating assets and liabilities:    
Accounts receivable 21,825 10,561
Inventories (12,384) 3,270
Income taxes (113) 0
Prepaid expenses and other assets (7,605) 2,338
Accounts payable 3,576 81
Accrued expenses and other liabilities 2,240 (1,962)
Accrued compensation (13,365) (11,203)
Deferred revenue (6,542) 9,065
Net cash (used in) provided by operating activities (991) 41,671
Cash flows from investing activities:    
Purchases of property, plant and equipment (11,615) (20,304)
Net cash used in investing activities (11,615) (20,304)
Cash flows from financing activities:    
Issuance of common stock upon exercise of stock options 4,693 2,957
Taxes paid on behalf of employees for equity activity (5,880) (4,015)
Payments of notes payable 0 (20,000)
Contingent consideration payments (793) (1,568)
Purchase of treasury stock (145) (81)
Net cash used in financing activities (2,125) (22,707)
Effect of exchange rate changes on cash, cash equivalents and restricted cash 45 (3)
Net decrease in cash, cash equivalents and restricted cash (14,686) (1,343)
Cash, cash equivalents and restricted cash at beginning of period 179,335 [1] 271,513
Cash, cash equivalents and restricted cash at end of period $ 164,649 [1] $ 270,170
[1] As of December 31, 2017 and March 31, 2018, the balance includes $1,043 of restricted cash.