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Fair Value of Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2015
Fair Value Disclosures [Abstract]  
Schedule of Fair Value of Financial Liabilities

The following table sets forth the fair value of the Company’s financial liabilities by level within the fair value hierarchy (in thousands):

 

 

 

At December 31, 2014

 

 

 

Level 1

 

 

Level 2

 

 

Level 3

 

 

Total

 

Convertible preferred stock warrant liability

 

$

—

 

 

$

—

 

 

$

138

 

 

$

138

 

 
Summary of Changes in Fair Value of Level 3 Financial Liabilities

 

The following table sets forth a summary of the changes in the fair value of the Company’s Level 3 financial liabilities (in thousands):

 

 

 

Year Ended December 31,

 

 

 

2015

 

 

2014

 

 

2013

 

Fair value, beginning of period

 

$

138

 

 

$

158

 

 

$

—

 

Issuance of convertible preferred stock warrant

 

 

—

 

 

 

—

 

 

 

158

 

Change in fair value of Level 3 financial liabilities

 

 

(45

)

 

 

(20

)

 

 

—

 

Fair value, end of period

 

$

93

 

 

$

138

 

 

$

158