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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 (loss) $ (1,288) $ 2,323
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Depreciation and amortization expense 779 947
Amortization of deferred rent (35) (39)
Stock-based compensation expense 340 319
Provision for doubtful accounts, net 6 34
Write-down of inventory to net realizable value 55 130
Loss on disposal of assets 54
Tax benefit from exercise of stock options (676)
Deferred income taxes 130
Changes in operating assets and liabilities:    
Receivables 280 (609)
Inventories (5,801) 548
Prepaid expenses and other assets (190) 24
Accounts payable 1,429 (719)
Accrued liabilities 253 36
Income taxes payable (393) 335
Deferred product revenue (85) 229
Other long-term liabilities (53)
Net cash provided by (used in) operating activities (4,650) 3,013
Cash flows from investing activities:    
Purchase of property and equipment (404) (402)
Purchase of intangibles (127)
Proceeds from maturities and sales of marketable securities 3,631 3,405
Purchase of marketable securities (3,051) (4,250)
Net cash provided by (used in) investing activities 49 (1,247)
Cash flows from financing activities:    
Net proceeds from equity-based compensation programs 82 476
Tax benefit from equity-based compensation programs 676
Repurchase and cancellation of stock options (1,752)
Dividend payments (1,051) (924)
Repurchase and cancellation of stock (3,210) (4,115)
Net cash used in financing activities (4,179) (5,639)
Effect of exchange rate changes on cash and cash equivalents 47 6
Net decrease in cash and cash equivalents (8,733) (3,867)
Cash and cash equivalents at the beginning of the period 12,100 13,412
Cash and cash equivalents at the end of the period 3,367 9,545
Supplemental disclosure of cash flow information:    
Cash paid for income taxes $ 6 $ 715