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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash flows from operating activities:      
Net income: $ 28,353 $ 11,681 $ 9,345
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 10,507 5,334 4,594
Non-cash interest expense 3,977 2,274  
Stock-based compensation expense 6,747 4,595 3,598
Deferred tax benefit (24,679) (4,092) (118)
Loss on revaluation of contingent consideration   3,242 4,083
Gain on sale of fixed assets   (15)  
Loss on disposal of assets 64 7 1
Changes in assets and liabilities:      
Accounts receivable (6,888) (3,222) (3,729)
Royalties and other receivables 644 (652) 158
Inventories 605 (6,163) (6,149)
Prepaid expenses and other assets (1,304) 612 (277)
Accounts payable 807 (1,802) 3,024
Accrued liabilities (1,993) (4,038) (1,592)
Long-term liabilities 611 (240) 2,115
Net cash provided by operating activities 17,451 7,521 15,053
Cash flows from investing activities:      
Purchases of marketable securities (47) (23,700) (20,168)
Redemptions of marketable securities 19,600 23,400 27,587
Decrease of restricted cash 450    
Proceeds from sale of fixed assets   45  
Purchases of property, plant and equipment (5,454) (4,325) (2,628)
Net cash provided by (used in) investing activities (98,246) (49,194) 4,791
Cash flows from financing activities:      
Proceeds from issuance of senior convertible notes, net of issuance costs   111,070  
Proceeds from issuance of common stock, net of issuance costs 129,309    
Exercise of stock options 2,351 1,841 866
Payments of contingent consideration (1,715) (798) (99)
Net cash provided by financing activities 129,945 112,113 767
Effect of exchange rate changes on cash and cash equivalents 2,376 (2,299) (1,882)
Net increase (decrease) in cash and cash equivalents 51,526 68,141 18,729
Cash and cash equivalents, beginning of period 122,233 54,092 35,363
Cash and cash equivalents, end of period 173,759 122,233 54,092
Supplemental information:      
Income taxes paid 4,021 3,993 $ 4,948
Interest paid 2,444 1,222  
Payment of contingent consideration in common stock 1,063 875  
Spectrum Inc.      
Cash flows from investing activities:      
Acquisition of assets, net of cash acquired (112,795)    
Supplemental information:      
Common stock tendered for acquisition of assets $ 247,575    
Atoll GmbH      
Cash flows from investing activities:      
Acquisition of assets, net of cash acquired   (8,767)  
Supplemental information:      
Common stock tendered for acquisition of assets   14,135  
TangenX Technology Corporation      
Cash flows from investing activities:      
Acquisition of assets, net of cash acquired   $ (35,847)