Convertible Preferred Stock
 6 Months Ended
Jun. 30, 2015
Temporary Equity, Other Disclosures [Abstract]  
Convertible Preferred Stock
Convertible Preferred Stock
As described in Note 1, on the Closing Date, the Company completed an IPO of its common stock. Upon the completion of the IPO, all outstanding shares of the Company’s convertible preferred stock were automatically converted into an aggregate of 14,848,824 shares of common stock.
The following table summarizes the issuances of convertible preferred stock subject to conversion as of the IPO completion:
 
Number of Shares
Authorized
 
Number of Shares
Outstanding
 
Original Issue and
Conversion Price
per Share
Series A convertible preferred stock
2,486,507

 
2,383,745

 
$
0.582

Series B convertible preferred stock
3,649,368

 
3,649,368

 
$
0.84656

Series C convertible preferred stock
5,406,501

 
5,406,501

 
$
1.4798

Series D convertible preferred stock
3,409,250

 
3,409,210

 
$
3.8132

Total convertible preferred stock
14,951,626

 
14,848,824

 
 

Summary of Activity
The following table presents a summary of activity for the convertible preferred stock issued and outstanding for the six months ended June 30, 2015 (in thousands):
 
Convertible Preferred Stock
 
Series A
 
Series B
 
Series C
 
Series D
 
Total Amount
Balance, December 31, 2014
$
1,387

 
$
3,089

 
$
8,000

 
$
13,000

 
$
25,476

Conversion to common stock upon IPO
(1,387
)
 
(3,089
)
 
(8,000
)
 
(13,000
)
 
(25,476
)
Balance, June 30, 2015
$
—

 
$
—

 
$
—

 
$
—

 
$
—