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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

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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration