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Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2017
Fair Value Disclosures [Abstract]  
Summary of changes in the fair value of preferred stock warrants

The changes in the fair value of preferred stock warrants were as follows (in thousands):

 

     Three Months
Ended
March 31, 2016
 

Beginning balance

   $ 6,927  

Change in value of preferred stock warrants recorded in other expense, net

     4,383  

Reclassification to convertible preferred stock upon net exercise of Series Seed warrant

     (3,789
  

 

 

 

Ending balance

   $ 7,521  
  

 

 

 
Schedule of assumptions utilized to determine the fair value of preferred stock warrants

The Company determined the fair value of the preferred stock warrants utilizing the Black-Scholes model with the following assumptions:

 

     As of March 31, 2016  
     Series Seed     Series A3  

Contractual term (years)

     5.4       7.0  

Expected volatility

     61.1     61.1

Risk-free interest rate

     1.30     1.54

Estimated dividend yield

     —       —