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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Cash flows from operating activities:    
Net income $ 573 $ 2,199
Adjustments to reconcile net income to net cash provided:    
Depreciation and amortization 2,633 2,622
Deferred tax expense (benefit) (395) (547)
Stock-based compensation 544 1,547
Changes in assets and liabilities:    
Accounts receivable, net 1,715 (7,749)
Inventories, net (1,403) 2,594
Other current assets (738) (337)
Accounts payable (1,507) (217)
Income taxes payable (2,914) (917)
Accrued expenses 1,265 (1,284)
Deferred compensation 243 (1,373)
Deferred revenue 1,691 6,611
Net cash provided by operating activities 1,707 3,149
Cash flows from investing activities:    
Purchase of short term investments (69,626) (19,935)
Maturities of short term investments 75,000 10,018
Additions to property and equipment (242) (1,246)
Other assets (5) (33)
Net cash provided by (used in) investing activities 5,127 (11,196)
Cash flows from financing activities:    
Tax payments for restricted stock issuances (154) (421)
Net cash used in financing activities (154) (421)
Effect of exchange rate changes on cash 253 267
Net increase (decrease) in cash 6,933 (8,201)
Cash and equivalents, beginning of year 49,345 78,522
Cash and equivalents, end of period $ 56,278 $ 70,321