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DEBT (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 28, 2012 | Sep. 30, 2014 | Aug. 31, 2014 | Feb. 28, 2014 | Jan. 31, 2014 | Feb. 28, 2013 | Oct. 31, 2012 | Aug. 31, 2012 | Dec. 31, 2014 | Dec. 31, 2013
Loan and Security Agreements |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 1,000 |  |  |  |  |  |  |  |  |
Proceeds from notes payable, net of original note payoff |  |  |  |  |  |  |  |  | $ 7,056 | $ 500
Common stock warrant, Silicon Valley Bank, Original Term Loan |  |  |  |  |  |  |  |  |  |
Loan and Security Agreements |  |  |  |  |  |  |  |  |  |
Common stock that may be purchased upon exercise of warrant (in shares) | 23,810 |  |  |  |  |  |  |  |  |
Exercise price of warrant (in dollars per share) | $ 0.07 |  |  |  |  |  |  |  |  |
Common stock warrant, Silicon Valley Bank, Term Loan, Amendment No. 1 |  |  |  |  |  |  |  |  |  |
Loan and Security Agreements |  |  |  |  |  |  |  |  |  |
Common stock that may be purchased upon exercise of warrant (in shares) |  |  |  | 14,430 |  |  |  |  |  |
Exercise price of warrant (in dollars per share) |  |  |  | $ 0.05 |  |  |  |  |  |
Common stock warrant, Silicon Valley Bank, Term Loan, Amendment No. 2 |  |  |  |  |  |  |  |  |  |
Loan and Security Agreements |  |  |  |  |  |  |  |  |  |
Common stock that may be purchased upon exercise of warrant (in shares) |  |  | 86,580 |  |  |  |  |  |  |
Exercise price of warrant (in dollars per share) |  |  | $ 0.05 |  |  |  |  |  |  |
Term loan | Silicon Valley Bank loan agreement |  |  |  |  |  |  |  |  |  |
Loan and Security Agreements |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 1,000 |  |  |  |  |  |  |  |  |
Amount borrowed |  |  |  |  |  | $ 500 | $ 250 | $ 250 |  |
Initial period of interest only payments | 12 months |  |  |  |  |  |  |  |  |
Subsequent period of principal and interest payments | 36 months |  |  |  |  |  |  |  |  |
Deferred financing costs | $ 38 |  |  |  | $ 22 |  |  |  |  |
Financing costs repaid |  |  |  |  | 16 |  |  |  |  |
Deferred financing costs, net |  |  |  |  |  |  |  |  | 7 | 15
Outstanding amount of loans |  |  |  |  |  |  |  |  | 8,000 | 958
Interest expense on notes payable |  |  |  |  |  |  |  |  | $ 208 | $ 62
Term loan | Silicon Valley Bank loan agreement | Prime |  |  |  |  |  |  |  |  |  |
Loan and Security Agreements |  |  |  |  |  |  |  |  |  |
Variable interest rate margin (as a percent) |  |  |  |  |  |  |  |  | 2.25% | 2.25%
Interest rate (as a percent) | 5.50% |  |  |  |  |  |  |  |  |
Term loan | Silicon Valley Bank loan agreement, Amendment No. 1 |  |  |  |  |  |  |  |  |  |
Loan and Security Agreements |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 6,000 |  |  |  |  |
Amount borrowed |  |  |  | $ 2,000 |  |  |  |  |  |
Proceeds from notes payable, net of original note payoff |  |  |  | $ 1,056 |  |  |  |  |  |
Initial period of interest only payments |  |  |  | 12 months |  |  |  |  |  |
Subsequent period of principal and interest payments |  |  |  | 36 months |  |  |  |  |  |
Term loan | Silicon Valley Bank loan agreement, Amendment No. 1 | Prime |  |  |  |  |  |  |  |  |  |
Loan and Security Agreements |  |  |  |  |  |  |  |  |  |
Variable rate basis |  |  |  |  | 1.75% |  |  |  |  |
Interest rate (as a percent) |  |  |  | 5.00% |  |  |  |  |  |
Term loan | Silicon Valley Bank loan agreement Amendment No. 2 |  |  |  |  |  |  |  |  |  |
Loan and Security Agreements |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 8,000 |  |  |  |  |  |  |
Amount borrowed |  | $ 3,000 | $ 3,000 |  |  |  |  |  |  |
Initial period of interest only payments |  |  | 12 months |  |  |  |  |  |  |
Subsequent period of principal and interest payments |  |  | 36 months |  |  |  |  |  |  |
Term loan | Silicon Valley Bank loan agreement Amendment No. 2 | Prime |  |  |  |  |  |  |  |  |  |
Loan and Security Agreements |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 5.00% |  |  |  |  |  |  |

X
- Definition Period of time after the end of the interest only period to maturity of each borrowing, the required periodic payments include both interest and principal payments, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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