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Loan Agreements (Tables) | 12 Months Ended
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Dec. 31, 2014
Debt Instrument [Line Items] |
Summary of Minimum Future Principal Payments | The minimum future principal payments are as follows (in thousands):
Year Ending December 31, |  |  |  |
2015 |  | $ | 3,321 |
Unamortized discount relating to warrants |  |  | (197 | )
Total |  |  | 3,124 |
Less current portion |  |  | (3,124 | )
Long-term portion |  | $ | - |
Fair Value of Preferred Stock Warrants Calculated using Black-Scholes Assumptions | The Company’s warrants were valued using the Black-Scholes option-pricing model. The fair values were derived by applying the following assumptions:
|  | December 31, 2013 |
Expected life |  | 4-8 years |
Risk-free interest rate |  |  | 2.90 | %
Expected volatility |  | 64%-84% |
Expected dividend rate |  | —% |
Loan and Security Agreement with Bank [Member] |
Debt Instrument [Line Items] |
Fair Value of Preferred Stock Warrants Calculated using Black-Scholes Assumptions | The following table shows the Black-Scholes assumptions used to value the preferred stock warrants in connection with the loan and security agreement on the respective dates:
|  | Series D Preferred Stock Warrants |
|  | December 2011 |  |  | March 2012 |  |  | August 2012 |
Contractual life |  | 10 years |  |  | 9.69 years |  |  | 9.29 years |
Volatility rate |  |  | 80 | % |  |  | 80 | % |  |  | 80 | %
Risk-free interest rate |  |  | 1.98 | % |  |  | 2.17 | % |  |  | 1.68 | %
Expected dividends |  |  | — |  |  |  | — |  |  |  | — |

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- Definition Tabular disclosure of the inputs and valuation techniques used to measure fair value, and a discussion of changes in valuation techniques and related inputs, if any, applied during the period to each separate class of assets, liabilities, and financial instruments classified in shareholders' equity that are measured on a recurring and/or nonrecurring basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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