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Convertible Preferred Stock (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 2 Months Ended 3 Months Ended
Mar. 31, 2015
USD ($)
director
installment
$ / shares
shares
Feb. 28, 2015
Mar. 31, 2015
USD ($)
$ / shares
Mar. 31, 2014
USD ($)
Preferred stock        
Principal amount converted     $ 5,000  
Gain on extinguishment for amendment to dividend terms     31,806  
Accretion of preferred stock     23,931 $ 814
6.0% Convertible promissory notes        
Preferred stock        
Principal amount converted $ 5,000      
Series D convertible redeemable preferred stock        
Preferred stock        
Issuance of stock (in shares) | shares 41,666,667      
Aggregate consideration $ 50,000      
Cash consideration from issuance of preferred stock $ 45,000      
Dividend rate (as a percent) 12.00%      
Number of directors holders of record are entitled to elect | director 1      
Cumulative accrued dividends $ 411   $ 411  
Conversion price (in dollars per share) | $ / shares $ 1.20      
Liquidation rights, ratio applied to original issue price 1      
Liquidation preference (in dollars per share) | $ / shares $ 1.20   $ 1.20  
Optional redemption feature, number of installment payments | installment 3      
Series D convertible redeemable preferred stock | Mandatory conversion, initial public offering | Minimum        
Preferred stock        
Gross proceeds from sale of stock $ 50,000      
Series A convertible redeemable preferred stock        
Preferred stock        
Dividend rate (as a percent)   4.50%    
Series B convertible redeemable preferred stock        
Preferred stock        
Dividend rate (as a percent)   8.00%    
Series C convertible redeemable preferred stock        
Preferred stock        
Dividend rate (as a percent)   8.00%    
Series A, Series B and Series C convertible redeemable preferred stock        
Preferred stock        
Accrued dividends 622      
Gain on extinguishment for amendment to dividend terms 31,806      
Series A, Series B and Series C convertible redeemable preferred stock | Mandatory conversion, initial public offering | Minimum        
Preferred stock        
Gross proceeds from sale of stock $ 50,000      
Series A, Series B and Series C convertible redeemable preferred stock | Automatic conversion at option of holder | Minimum        
Preferred stock        
Written consent or affirmative vote of outstanding shares to effect a conversion (as a percent) 60.00%      
All series of convertible redeemable preferred stock        
Preferred stock        
Accretion of preferred stock     $ 23,931