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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Cash flows from operating activities:    
Net income from continuing operations $ 5,025 $ 27,523
Adjustments to reconcile net income from continuing operations to net cash provided by continuing operations:    
Depreciation and amortization 5,275 2,929
Loss on asset disposal 14 0
Deferred tax expense (benefit) (2,726) 1,415
Stock-based compensation 2,943 1,677
Changes in assets and liabilities:    
Accounts receivable, net (3,065) (12,411)
Inventories 2,699 3,589
Foreign sales tax receivable 165 283
Other current assets 159 (22)
Accounts payable (891) (4,577)
Income taxes payable 1,310 223
Accrued expenses (953) (923)
Deferred compensation (944) (244)
Deferred revenue 5,889 364
Other long-term liabilities (7) 0
Net cash provided by operating activities of continuing operations 14,893 19,826
Cash flows from investing activities of continuing operations:    
Purchase of short term investments (70,096) (74,807)
Maturities of short term investments 14,876 64,847
Additions to property and equipment (1,793) (727)
Additions to intangible assets (12) (49)
Other assets (83) (18)
Net cash used in investing activities of continuing operations (57,108) (10,754)
Cash flows from financing activities of continuing operations:    
Tax payments for restricted stock issuances (1,000) (837)
Tax benefit of stock-based compensation 0 430
Net cash used in financing activities of continuing operations (1,000) (407)
Cash flows used in discontinued operations:    
Net cash used in operating activities of discontinued operations 0 (63)
Net cash used in discontinued operations 0 (63)
Effect of exchange rate changes on cash 271 1,067
Net increase (decrease) in cash (42,944) 9,669
Cash and equivalents, beginning of year 78,522 72,441
Cash and equivalents, end of period $ 35,578 $ 82,110