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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Cash flows from operating activities:    
Net loss $ (6,690) $ (5,015)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation expense 1,339 2,351
Depreciation and amortization 64 40
Loss on disposal of property and equipment 1   
Changes in operating assets and liabilities:    
Accounts receivable 1,431 1,623
Other assets (1)   
Prepaid expenses (364) (96)
Accounts payable and accrued expenses 20 87
Deferred revenue 88 (363)
Net cash used in operating activities (4,112) (1,373)
Cash flows from investing activities:    
Purchase of property and equipment (34) (268)
Net cash used in investing activities (34) (268)
Cash flows from financing activities:    
Proceeds from exercise of stock options 166   
Proceeds from exercise of warrants 200 8
Net cash provided by financing activities 366 8
Effect of exchange rate changes on cash 37 (32)
Net decrease in cash (3,743) (1,665)
Cash at beginning of period 9,097 12,940
Cash at end of period 5,354 11,275
Supplemental disclosure of cash flow information:    
Interest Paid      
Income taxes paid $ 30 $ 42