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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Cash flows from operating activities:    
Net income $ 5,179 $ 26,647
Adjustments to reconcile net income to net cash provided by (used in) operations:    
Depreciation and amortization expense 1,422 1,917
Amortization of deferred rent (110) (41)
Stock-based compensation expense 296 241
Provision for doubtful accounts 69 25
Write-down of inventory to net realizable value 996 1,235
Loss on disposal of assets 49 0
Tax benefit from exercise of stock options (104) (2)
Changes in operating assets and liabilities:    
Receivables (1,059) 44
Inventories (998) 447
Deferred income taxes (6) (1,457)
Prepaid expenses and other assets (1,251) (652)
Accounts payable 428 (512)
Accrued liabilities (408) (130)
Income taxes payable (14,782) 14,492
Deferred product revenue 565 189
Other long-term liabilities (238) 1,481
Net cash provided by (used in) operating activities (9,952) 43,924
Cash flows from investing activities:    
Purchase of property and equipment (1,040) (574)
Purchase of marketable securities (25,502) 0
Payment towards business acquisitions 0 (4,632)
Net cash used in investing activities (26,542) (5,206)
Cash flows from financing activities:    
Proceeds from the exercise of stock options 489 490
Tax benefit from the exercise of stock options 104 2
Treasury stock purchased (2,416) (384)
Net cash provided by (used in) financing activities (1,823) 108
Net increase (decrease) in cash and cash equivalents (38,317) 38,826
Cash and cash equivalents at the beginning of the period 55,509 16,683
Cash and cash equivalents at the end of the period 17,192 55,509
Supplemental disclosure of cash flow information:    
Cash paid for income taxes 18,021 1,393
Supplemental disclosure of non-cash activities:    
Inventory 0 40
Property and equipment 0 34
Product warranty liability 0 (8)
Proprietary software 0 2,247
Goodwill 0 2,319
Cash paid $ 0 $ 4,632