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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Cash flows from operating activities:      
Net income from continuing operations $ 10,561 $ 42,194 $ 32,611
Adjustments to reconcile net income from continuing operations to net cash provided by continuing operations:      
Depreciation and amortization 10,777 6,302 6,156
Loss on disposal of assets 14 0 0
Deferred tax expense (benefit) (4,936) (691) 492
Stock-based compensation 2,766 3,835 2,399
Changes in assets and liabilities, net of effect of acquisitions:      
Accounts receivable, net (8,106) 2,860 (4,660)
Inventories 3,198 13,257 (8,222)
Foreign sales tax receivable 336 49 (112)
Other current assets (419) (243) 1,150
Accounts payable 163 (6,645) 4,531
Income taxes payable (582) 2,946 (2,063)
Accrued expenses 4 1,351 3,344
Current deferred compensation 226 697 691
Deferred revenue 14,396 2,996 2,437
Other long-term liabilities 55 42 0
Net cash provided by operating activities of continuing operations 28,453 68,950 38,754
Cash flows from investing activities of continuing operations:      
Purchase of short term investments (184,690) (109,747) (94,856)
Maturities of short term investments 134,775 129,725 29,916
Additions to property and equipment (2,043) (1,362) (1,453)
Additions to intangible assets (144) (89) (112)
Other assets (4,394) 3 (1,295)
Net cash used in investing activities of continuing operations (56,496) (55,956) (67,800)
Cash flows from financing activities of continuing operations:      
Repayment of debt 0 (5,925) 0
Proceeds from exercise of stock options, net 0 0 51
Tax payments for restricted stock issuances (1,051) (837) (123)
Tax benefit of stock-based compensation 0 318 253
Net cash provided by (used in) financing activities of continuing operations (1,051) (6,444) 181
Cash flows from discontinued operations:      
Net cash provided by (used in) operating activities of discontinued operations (38) (158) 2,864
Net cash provided by (used in) discontinued operations (38) (158) 2,864
Effect of exchange rate changes on cash (45) (311) (165)
Net increase (decrease) in cash (29,177) 6,081 (26,166)
Cash and equivalents, beginning of year 78,522 72,441 98,607
Cash and equivalents, end of year 49,345 78,522 72,441
Supplemental cash flow disclosures:      
Cash paid for income taxes 5,982 6,781 6,109
Cash paid for interest 0 0 0
Silanis Technology Inc [Member]      
Cash flows from investing activities of continuing operations:      
Purchase of Silanis, net of cash acquired $ 0 $ (74,486) $ 0