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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Cash flows from operating activities:    
Net income $ 1,775 $ 1,128
Adjustments to reconcile net income to net cash provided by operations:    
Depreciation and amortization expense 644 654
Amortization of deferred rent (167) 0
Stock-based compensation expense 126 111
Provision for (recoveries of) doubtful accounts, net 27 (64)
Inventory valuation reserve adjustments (34) 278
Excess Tax Benefit (Tax Deficiency) from Share-based Compensation, Operating Activities (38) 0
Changes in operating assets and liabilities:    
Receivables (78) 1,112
Inventories (1,051) (2,616)
Deferred income taxes 0 (11)
Prepaid expenses and other assets (414) (39)
Accounts payable 729 (1,529)
Accrued liabilities (24) 121
Income taxes payable (14,782) (750)
Deferred product revenue 707 47
Other long-term liabilities 0 138
Net cash (used in) operating activities (12,580) (1,420)
Cash flows from investing activities:    
Purchase of property and equipment (457) (202)
Purchase of marketable securities (9,297) 0
Payment towards business acquisitions 0 (4,632)
Net cash (used in) investing activities (9,754) (4,834)
Cash flows from financing activities:    
Proceeds from the exercise of stock options 164 81
Excess Tax Benefit (Tax Deficiency) from Share-based Compensation, Financing Activities 38 0
Treasury stock purchased (991) (92)
Net cash (used in) financing activities (789) (11)
Net (decrease) in cash and cash equivalents (23,123) (6,265)
Cash and cash equivalents at the beginning of the period 55,509 16,683
Cash and cash equivalents at the end of the period 32,386 10,418
Supplemental disclosure of cash flow information:    
Cash paid for income taxes $ 16,757 $ 1,393