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Loan Agreements (Tables)

12 Months Ended

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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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

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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

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