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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Cash flows from operating activities:      
Net loss $ (13,080) $ (9,287) $ (17,145)
Adjustments to reconcile net loss to net cash used in operating activities:      
Stock-based compensation 2,656 3,499 550
Depreciation and amortization 144 97 26
Loss on disposal of assets 8      
Debt discounts and deferred financing fees and the valuation of conversion features and warrants       14,735
Changes in operating assets and liabilities:      
Accounts receivable 1,155 1,253 (3,228)
Prepaid expenses and other current assets (641) (296) (79)
Accounts payable and accrued expenses 19 239 322
Deposits    (68)   
Deferred revenues 938 819 1,366
Net cash used in operating activities (8,801) (3,744) (3,453)
Cash flows used in investing activities:      
Purchase of property and equipment (155) (310) (114)
Cash flow from financing activities:      
Proceeds from issuance of convertible debt       4,228
Repayment of convertible debt       (25)
Proceeds from exercise of stock options 1,060      
Proceeds from exercise of warrants 714 223 515
Proceeds from issuance of common stock, warrant repricing and preferred stock 6,892    10,787
Net cash provided by financing activities 8,666 223 15,505
Effect of exchange rates on cash 8 (12) 91
Net increase (decrease) in cash (282) (3,843) 12,029
Cash at beginning of year 9,097 12,940 911
Cash at end of year 8,815 9,097 12,940
Supplemental disclosure of cash flow information:      
Cash paid for interest       27
Cash paid for income taxes 109 125 78
Reclassification of derivative liabilities to additional paid-in capital upon conversion of debt and exercise of warrants       20,075
Debt issuance costs recorded as part of 2011 financing transaction       35
Debt discount recorded as part of convertible debt financingtransactions, including warrants issued in financing transactions       4,228
Accrued expenses settled with shares of common stock       120
Conversion of debt and accrued interest to shares of common stock       7,222
Debt issuance costs recorded in connection of debt extinguishment transactions       $ 20,075