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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Cash flows from operating activities:    
Net income $ 683 $ 5,024
Adjustments to reconcile net income to net cash provided:    
Depreciation and amortization 5,258 5,275
Loss on asset disposal 0 14
Deferred tax expense (benefit) (1,134) (2,726)
Stock-based compensation 1,076 2,943
Changes in assets and liabilities:    
Accounts receivable, net 9,560 (3,065)
Inventories, net (255) 2,699
Other current assets 102 324
Accounts payable (748) (891)
Income taxes payable (2,740) 1,310
Accrued expenses (435) (953)
Deferred compensation (906) (944)
Deferred revenue 1,682 5,889
Other long-term liabilities (177) (7)
Net cash provided by operating activities 11,966 14,892
Cash flows from investing activities:    
Purchase of short term investments (99,459) (70,096)
Maturities of short term investments 95,000 14,876
Additions to property and equipment (716) (1,793)
Additions to intangible assets (40) (12)
Other assets 0 (83)
Net cash used in investing activities (5,215) (57,108)
Cash flows from financing activities:    
Tax payments for restricted stock issuances (199) (1,000)
Net cash used in financing activities (199) (1,000)
Effect of exchange rate changes on cash 505 271
Net increase (decrease) in cash 7,057 (42,945)
Cash and equivalents, beginning of year 49,345 78,522
Cash and equivalents, end of period $ 56,402 $ 35,577