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Summary of Significant Accounting Policies (Tables)
6 Months Ended
Jun. 30, 2015
Accounting Policies [Abstract]  
Summary of Cash Equivalents and Marketable Securities

The following tables summarize the Company’s cash equivalents and marketable securities as of June 30, 2015 and December 31, 2014:

 

     June 30, 2015  
     Total      Quoted
Prices in
Active
Markets
(Level 1)
     Significant
Other
Observable
Inputs
(Level 2)
     Significant
Unobservable
Inputs
(Level 3)
 

Cash equivalents:

           

Money market funds

   $ 61,133       $ 61,133       $ —         $ —     

Commercial paper

     2,000         —           2,000         —     
  

 

 

    

 

 

    

 

 

    

 

 

 

Total cash equivalents

     63,133         61,133         2,000         —     
  

 

 

    

 

 

    

 

 

    

 

 

 

Marketable securities:

           

Corporate bonds

     60,831         —           60,831         —     

U.S. government securities

     49,239         —           49,239         —     

Commercial paper

     26,477         —           26,477         —     
  

 

 

    

 

 

    

 

 

    

 

 

 

Total marketable securities

     136,547         —           136,547         —     
  

 

 

    

 

 

    

 

 

    

 

 

 

Total cash equivalents and marketable securities

   $ 199,680       $ 61,133       $ 138,547       $ —     
  

 

 

    

 

 

    

 

 

    

 

 

 

 

     December 31, 2014  
     Total      Quoted
Prices in
Active
Markets
(Level 1)
     Significant
Other
Observable
Inputs
(Level 2)
     Significant
Unobservable
Inputs
(Level 3)
 

Cash equivalents:

           

Money market funds

   $ 14,742       $ 14,742       $ —         $ —     

U.S. government securities

     27,767         —           27,767         —     
  

 

 

    

 

 

    

 

 

    

 

 

 

Total cash equivalents

     42,509         14,742         27,767         —     
  

 

 

    

 

 

    

 

 

    

 

 

 

Marketable securities:

           

U.S. government securities

     34,191         —           34,191         —     

Corporate bonds

     22,168         —           22,168         —     

Commercial paper

     1,000         —           1,000         —     
  

 

 

    

 

 

    

 

 

    

 

 

 

Total marketable securities

     57,359         —           57,359         —     
  

 

 

    

 

 

    

 

 

    

 

 

 

Total cash equivalents and marketable securities

   $ 99,868       $ 14,742       $ 85,126       $ —     
  

 

 

    

 

 

    

 

 

    

 

 

 

Summary of Marketable Securities

The following table summarizes the Company’s marketable securities as of June 30, 2015 and December 31, 2014:

 

     June 30, 2015  
Assets:    Amortized
Cost
     Gross
Unrealized
Gains
     Gross
Unrealized
Losses
     Fair Value  

Corporate bonds (due within 1 year)

   $ 57,396       $ —         $ (48    $ 57,348   

Corporate bonds (due after 1 year through 2 years)

     3,487            (4      3,483   

U.S. government securities (due within 1 year)

     49,240         —           (1      49,239   

Commercial paper (due within 1 year)

     26,484         —           (7      26,477   
  

 

 

    

 

 

    

 

 

    

 

 

 
   $ 136,607       $ —         $ (60    $ 136,547   
  

 

 

    

 

 

    

 

 

    

 

 

 

 

     December 31, 2014  
Assets:    Amortized
Cost
     Gross
Unrealized
Gains
     Gross
Unrealized
Losses
     Fair Value  

U.S. government securities (due within 1 year)

   $ 34,200       $ —         $ (9    $ 34,191   

Corporate bonds (due within 1 year)

     18,716         —           (18      18,698   

Corporate bonds (due after 1 year through 2 years)

     3,478         —           (8      3,470   

Commercial paper (due within 1 year)

     1,000         —           —           1,000   
  

 

 

    

 

 

    

 

 

    

 

 

 
   $ 57,394       $ —         $ (35    $ 57,359   
  

 

 

    

 

 

    

 

 

    

 

 

 

Computation of Basic and Diluted Earnings Per Share

Basic and diluted net loss per share attributable to common stockholders was calculated as follows:

 

    For the three months ended
June 30,
    For the six months ended
June 30,
 
    2015     2014     2015     2014  

Basic and diluted net loss per share attributable to common stockholders:

       

Numerator:

       

Net loss

  $ (17,756   $ (6,400   $ (31,228   $ (10,858

Accretion of redeemable convertible preferred stock to redemption value

    —          (43     —          (92
 

 

 

   

 

 

   

 

 

   

 

 

 

Net loss attributable to common stockholders

  $ (17,756   $ (6,443   $ (31,228   $ (10,950
 

 

 

   

 

 

   

 

 

   

 

 

 

Denominator:

       

Weighted average of common shares outstanding, basic and diluted

    27,011,960        2,178,465        26,316,619        1,457,931   
 

 

 

   

 

 

   

 

 

   

 

 

 

Net loss per share attributable to common stockholders, basic and diluted

  $ (0.66   $ (2.96   $ (1.19   $ (7.51
 

 

 

   

 

 

   

 

 

   

 

 

 

Summary of Common Stock Equivalents Outstanding

The following common stock equivalents outstanding (prior to consideration of the treasury stock method) as of June 30, 2015 and 2014, were excluded from the computation of diluted net loss per share for the three and six months ended June 30, 2015 and 2014, because they had an anti-dilutive impact:

 

     As of June 30,  
     2015      2014  

Options to purchase common stock

     2,500,741         1,839,895   

Unvested restricted stock

     2,903         —     
  

 

 

    

 

 

 
     2,503,644         1,839,895