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Convertible Preferred Stock Warrants and Common Stock Warrants (Tables)
12 Months Ended
Dec. 31, 2014
Warrants And Rights Note Disclosure [Abstract]  
Summary of Outstanding Warrants

As of December 31, 2014, outstanding warrants consisted of the following:

 

Common Stock Warrants:

 

Number of Warrants

 

 

Date Issued

 

Term

 

Exercise 

Price

 

Common stock

 

 

83,167

 

 

June 2010

 

10 years

 

$

3.006

 

Common stock

 

 

174,651

 

 

February 2011

 

10 years

 

 

3.006

 

Common stock

 

 

66,533

 

 

June 2011

 

10 years

 

 

3.006

 

Total common stock warrants

 

 

324,351

 

 

 

 

 

 

 

 

 

 

As of December 31, 2013, outstanding warrants consisted of the following:

 

Convertible Preferred Stock Warrants:

 

Number of Warrants

 

 

Date Issued

 

Term

 

Exercise   

Price

 

Series A

 

 

241,803

 

 

June 2010

 

10 years

 

$

1.034

 

Series A

 

 

592,417

 

 

February 2011

 

10 years

 

 

1.034

 

Series A

 

 

193,442

 

 

June 2011

 

10 years

 

 

1.034

 

Total convertible preferred stock warrants

 

 

1,027,662