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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Operating Activities    
Net income $ 1,543 $ 1,339
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 552 760
Amortization 226 223
Provision for doubtful accounts (1)  
Deferred income taxes (15) 120
Stock based compensation 210 637
Changes in operating assets and liabilities:    
Accounts receivable 8,145 (938)
Inventories (18) (177)
Prepaid expenses, other current assets and other noncurrent assets 118 (239)
Accounts payable (651) (1,380)
Accrued liabilities and other noncurrent liabilities (4,634) (2,274)
Net cash provided by (used in) operating activities 5,475 (1,929)
Investing Activities    
Purchases of property, equipment and patents (788) (841)
Net cash (used in) investing activities (788) (841)
Financing Activities    
Payments to repurchase common stock (1,889)  
Proceeds from exercise of stock options   54
Net cash (used in) provided by financing activities (1,889) 54
Effect of exchange rate fluctuations on cash 28 57
Net increase (decrease) in cash and cash equivalents 2,826 (2,659)
Cash and cash equivalents at beginning of period 28,229 30,524
Cash and cash equivalents at end of period $ 31,055 $ 27,865