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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Cash flows from operating activities:    
Net income $ 3,438 $ 5,502
Adjustments to reconcile net income to net cash provided:    
Depreciation and amortization 7,893 7,930
Loss on asset disposal 227 14
Deferred tax expense (benefit) 73 (1,816)
Stock-based compensation 1,901 4,066
Changes in assets and liabilities:    
Accounts receivable, net 3,854 2,545
Inventories, net (97) 2,179
Other current assets (751) 608
Accounts payable (2,808) (2,132)
Income taxes payable (2,089) (651)
Accrued expenses 2,096 (882)
Deferred compensation (656) (488)
Deferred revenue 2,093 8,021
Other long-term liabilities (125) (10)
Net cash provided by operating activities 15,049 24,886
Cash flows from investing activities:    
Purchase of short term investments (168,731) (159,771)
Maturities of short term investments 155,000 94,653
Additions to property and equipment (1,323) (2,004)
Additions to intangible assets (65) (85)
Other assets (397) (4,095)
Net cash used in investing activities (15,516) (71,302)
Cash flows from financing activities:    
Tax payments for restricted stock issuances (257) (1,000)
Net cash used in financing activities (257) (1,000)
Effect of exchange rate changes on cash 640 351
Net decrease in cash (84) (47,065)
Cash and equivalents, beginning of period 49,345 78,522
Cash and equivalents, end of period $ 49,261 $ 31,457