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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Cash flows from operating activities:      
Net income from continuing operations $ 42,194 $ 32,611 $ 10,967
Adjustments to reconcile net income from continuing operations to net cash provided by continuing operations:      
Depreciation and amortization 6,302 6,156 5,042
Loss on disposal of assets 0 0 275
Deferred tax expense (benefit) (691) 492 (6,118)
Stock-based compensation 3,835 2,399 2,587
Changes in assets and liabilities, net of effect of acquisitions:      
Accounts receivable, net 2,860 (4,660) (39)
Inventories 13,257 (8,222) (6,492)
Foreign sales tax receivable 49 (112) (135)
Other current assets (243) 1,150 (2,865)
Accounts payable (6,645) 4,531 (1,460)
Income taxes payable 2,946 (2,063) 3,641
Accrued expenses 1,351 3,344 565
Current deferred compensation 697 691 (2,424)
Deferred revenue 2,996 2,437 6,787
Other long-term liabilities 42 0 0
Net cash provided by operating activities of continuing operations 68,950 38,754 10,331
Cash flows from investing activities of continuing operations:      
Purchase of short term investments (109,747) (94,856) 0
Maturities of short term investments 129,725 29,916 0
Additions to property and equipment (1,362) (1,453) (944)
Additions to intangible assets (89) (112) (294)
Other assets 3 (1,295) 267
Net cash used in investing activities of continuing operations (55,956) (67,800) (20,466)
Cash flows from financing activities of continuing operations:      
Repayment of debt (5,925) 0 0
Proceeds from exercise of stock options, net 0 51 114
Tax payments for restricted stock issuances (837) (123) (998)
Tax benefit of stock-based compensation 318 253 3,318
Net cash provided by (used in) financing activities of continuing operations (6,444) 181 2,434
Cash flows from discontinued operations:      
Net cash provided by (used in) operating activities of discontinued operations (158) 2,864 (306)
Net cash provided by (used in) discontinued operations (158) 2,864 (306)
Effect of exchange rate changes on cash (311) (165) 145
Net increase (decrease) in cash 6,081 (26,166) (7,862)
Cash and equivalents, beginning of year 72,441 98,607 106,469
Cash and equivalents, end of year 78,522 72,441 98,607
Supplemental cash flow disclosures:      
Cash paid for income taxes 6,781 6,109 3,121
Cash paid for interest 0 0 0
Silanis Technology Inc [Member]      
Cash flows from investing activities of continuing operations:      
Purchase, net of cash acquired (74,486) 0 0
Cronto [Member]      
Cash flows from investing activities of continuing operations:      
Purchase, net of cash acquired $ 0 $ 0 $ (19,495)