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Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2015
Fair Value Disclosures [Abstract]  
Schedule of fair value of the warrants

The fair value of the Warrants at March 31, 2015 was determined by using an option pricing model with the following assumptions:

 

 

 

2015

Warrants

 

 

2013

Warrants

 

 

2012

Warrants

 

Expected volatility

 

 

89.08%

 

 

 

90.64%

 

 

 

76.58%

 

Risk-free interest rates

 

 

1.31%

 

 

 

1.01%

 

 

 

0.03%

 

Expected life (in years)

 

 

4.88

 

 

 

3.58

 

 

 

0.17

 

 

Assets and liabilities measured at fair value on a recurring basis

The table below presents the Company’s assets and liabilities measured at fair value on a recurring basis as of March 31, 2015, aggregated by the level in the fair value hierarchy within which those measurements fall in accordance with ASC 820.

 

 

 

Assets and Liabilities Measured at Fair Value on a Recurring Basis

 

(in thousands)

 

Level 1

 

 

Level 2

 

 

Level 3

 

 

Balance at

March 31, 2015

 

Assets

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Money market funds

 

$

1,943

 

 

$

 

 

$

 

 

$

1,943

 

Liabilities

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Derivative instrument liabilities

 

$

 

 

$

 

 

$

836

 

 

$

836

 

 

Fair value measurements using significant unobservable inputs

The table below presents the activity within Level 3 of the fair value hierarchy for the three months ended March 31, 2015:

Fair Value Measurements Using Significant Unobservable Inputs (Level 3)

 

(in thousands)

 

Warrant Liability

 

Balance at December 31, 2014

 

$

225

 

Total change in the liability included in earnings

 

 

(209

)

Fair value of warrants issued

 

 

820

 

Balance at March 31, 2015

 

$

836