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Redeemable Convertible Preferred Stock (Tables)
3 Months Ended
Mar. 31, 2015
Equity [Abstract]  
Summary of Activity for Preferred Stock
The following table presents a summary of activity for the preferred stock issued and outstanding for the three months ended March 31, 2014 (in thousands): 
 
Series A
 
Series B
 
Series C
 
Series C-1
 
Series D
 
Series E
 
Total
Amount
Balance, December 31, 2013
$
2,559

 
$
22,918

 
$
24,749

 
$
5,401

 
$
62,716

 
$

 
$
118,343

Issuance of preferred stock

 

 

 

 

 
77,000

 
77,000

Accretion of dividends on preferred stock
33

 
317

 
409

 
94

 
1,204

 
548

 
2,605

Balance, March 31, 2014
$
2,592

 
$
23,235

 
$
25,158

 
$
5,495

 
$
63,920

 
$
77,548

 
$
197,948