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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Cash flows from operating activities:    
Net income from continuing operations $ 2,199 $ 13,657
Adjustments to reconcile net income from continuing operations to net cash provided by continuing operations:    
Depreciation and amortization 2,622 1,469
Deferred tax expense (benefit) (547) 1,151
Stock-based compensation 1,547 795
Changes in assets and liabilities:    
Accounts receivable, net (7,749) (3,968)
Inventories 2,594 1,178
Foreign sales tax receivable 107 366
Other current assets (441) (860)
Accounts payable (217) (547)
Income taxes payable (917) 393
Accrued expenses (1,284) (1,208)
Deferred compensation (1,373) (721)
Deferred revenue 6,611 582
Other long term liabilities (3) 0
Net cash provided by operating activities of continuing operations 3,149 12,287
Cash flows from investing activities of continuing operations:    
Purchase of short term investments (19,935) (39,871)
Maturities of short term investments 10,018 29,931
Additions to property and equipment (1,246) (320)
Additions to intangible assets (24) (11)
Other assets (9) (6)
Net cash used in investing activities of continuing operations (11,196) (10,277)
Cash flows from financing activities of continuing operations:    
Tax payments for restricted stock issuances (421) (837)
Tax benefit of stock-based compensation 0 410
Net cash used in financing activities of continuing operations (421) (427)
Cash flows used in discontinued operations:    
Net cash used in operating activities of discontinued operations 0 0
Net cash used in discontinued operations 0 0
Effect of exchange rate changes on cash 267 183
Net increase (decrease) in cash (8,201) 1,766
Cash and equivalents, beginning of year 78,522 72,441
Cash and equivalents, end of period $ 70,321 $ 74,207