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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Cash paid for interest $ 3 $ 0
Cash flows from operating activities:    
Net income 5,596 5,179
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation and amortization expense 1,972 1,422
Amortization of deferred rent (79) (110)
Stock-based compensation expense 401 296
Provision for doubtful accounts (71) 69
Write-down of inventory to net realizable value 946 996
Loss on disposal of assets 0 49
Tax benefit from exercise of stock options (211) (104)
Deferred income taxes (495) (6)
Changes in operating assets and liabilities:    
Receivables (251) (1,059)
Inventories (2,614) (998)
Prepaid expenses and other assets 844 (1,251)
Accounts payable (84) 428
Accrued liabilities 1,451 (408)
Income taxes payable (947) (14,782)
Deferred product revenue 858 565
Other long-term liabilities (606) (238)
Net cash provided by (used in) operating activities 6,710 (9,952)
Cash flows from investing activities:    
Payment towards business acquisitions (13,068) 0
Purchase of property and equipment (642) (1,040)
Purchase of intangibles (90) 0
Proceeds from maturities of marketable securities 4,650 0
Purchase of marketable securities (5,266) (25,502)
Net cash used in investing activities (14,416) (26,542)
Cash flows from financing activities:    
Net proceeds from equity-based compensation programs 1,337 489
Tax benefits from equity-based compensation programs 211 104
Stock registration costs (55) 0
Dividend payments (914) 0
Payments for stock repurchases (2,598) (2,416)
Net cash used in financing activities (2,019) (1,823)
Effect of exchange rate changes on cash and cash equivalents (27) 0
Net (decrease) in cash and cash equivalents (9,752) (38,317)
Cash and cash equivalents at the beginning of the year 17,192 55,509
Cash and cash equivalents at the end of the year 7,440 17,192
Supplemental disclosure of cash flow information:    
Cash paid for interest 3 0
Cash paid for income taxes 3,017 18,021
Issuance of common stock in connection with acquisition of Sabine $ 1,679 $ 0