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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Cash flows from operating activities:    
Net income $ 16,175 $ 6,651
Adjustments to reconcile net income to net cash used in operating activities:    
Depreciation and amortization 6,374 3,844
Non-cash interest expense 2,958 1,320
Stock-based compensation expense 4,845 3,341
Deferred tax expense (13,062) 326
Loss on revaluation of contingent consideration   3,317
Gain on sale of fixed assets   (15)
Loss on disposal of assets 64 25
Changes in assets and liabilities:    
Accounts receivable (8,472) (3,270)
Other receivables 196 20
Inventories 699 (6,457)
Prepaid expenses and other current assets (739) 820
Other assets (704)  
Accounts payable 159 (1,918)
Accrued liabilities (6,089) (2,389)
Long-term liabilities (171) (48)
Net cash provided by operating activities 2,233 5,567
Cash flows from investing activities:    
Purchases of marketable securities (48) (21,394)
Redemptions of marketable securities 19,600 19,700
Proceeds from sale of fixed assets   45
Purchases of property, plant and equipment (3,686) (3,462)
Net cash used in investing activities (97,075) (13,878)
Cash flows from financing activities:    
Proceeds from issuance of common stock, net of issuance costs 129,309  
Proceeds from issuance of convertible senior notes, net of issuance costs   111,070
Exercise of stock options 2,035 1,630
Payment of contingent considerations (1,702) (498)
Net cash provided by financing activities 129,642 112,202
Effect of exchange rate changes on cash and cash equivalents 2,633 (332)
Net increase in cash and cash equivalents 37,433 103,559
Cash and cash equivalents, beginning of period 122,233 54,092
Cash and cash equivalents, end of period 159,666 157,651
Supplemental disclosure of non-cash activities:    
Income taxes paid 3,555 2,888
Interest paid 1,222  
Payment of contingent consideration in common stock 1,062 875
Spectrum Inc.    
Cash flows from investing activities:    
Acquisition of assets, net of cash received (112,941)  
Supplemental disclosure of non-cash activities:    
Stock tendered for acquisition of assets $ 247,575  
Atoll GmbH    
Cash flows from investing activities:    
Acquisition of assets, net of cash received   (8,767)
Supplemental disclosure of non-cash activities:    
Stock tendered for acquisition of assets   $ 14,135