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Convertible Preferred Stock Warrants (Tables)
 12 Months Ended
Dec. 31, 2014
Equity [Abstract]  
Assumptions Used to Value Convertible Preferred Stock Warrants

The assumptions used to value the convertible preferred stock warrants were as follows:

 

 

 

 

Year Ended

 

 

 

December 31,

 

 

 

2014

 

2013

 

Expected term (in years)

 

-

 

 

1.1

 

Expected volatility

 

-

 

 

75.00

%

Risk-free interest rate

 

-

 

 

0.13

%

Dividend yield

 

-

 

 

0

%