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Debt - Narrative (Details)
9 Months Ended
Jun. 10, 2015
USD ($)
trading_day
$ / shares
Oct. 31, 2014
USD ($)
Sep. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
Debt Instrument [Line Items]        
Conversion rate 0.2      
Conversion price ($ per share) | $ / shares $ 5.00      
Repurchase price 100.00%      
Remaining discount amortization period 5 years      
Stock Price Exceeds 130% of Conversion Price        
Debt Instrument [Line Items]        
Threshold of trading days | trading_day 20      
Threshold of consecutive trading days 30 days      
Threshold percentage of stock price trigger 130.00%      
Debt Trading Price Below Product of Stock Price and Conversion Rate        
Debt Instrument [Line Items]        
Threshold of consecutive trading days 5 days      
Threshold percentage of stock price trigger 98.00%      
Stock Price Exceeds 140% of Conversion Price        
Debt Instrument [Line Items]        
Threshold of trading days | trading_day 20      
Threshold of consecutive trading days 30 days      
Threshold percentage of stock price trigger 140.00%      
Repurchase price 100.00%      
Convertible Debt        
Debt Instrument [Line Items]        
Term of debt instrument 5 years      
Principal $ 120,000,000.0   $ 120,000,000  
Debt issuance costs $ 3,900,000      
Stated interest rate of debt issued 5.50%      
Minimum principal needed to call debt 25.00%      
Redemption of principal 100.00%      
Company elected remedy in default 60 days      
Interest for company elected remedy for default 0.50%      
Issuance cost allocated to equity $ 1,300,000      
Issuance cost allocated to liability $ 2,600,000      
Long-term debt     $ 80,350,000  
Effective interest rate     18.71%  
Convertible Debt | Debt Trading Price Below Product of Stock Price and Conversion Rate        
Debt Instrument [Line Items]        
Number of consecutive business days 5 days      
Accrued Liabilities | Convertible Debt        
Debt Instrument [Line Items]        
Debt issuance costs $ 400,000      
Revolving Credit Facility        
Debt Instrument [Line Items]        
Term of debt instrument   5 years    
Maximum amount of credit facility   $ 25,000,000    
Outstanding borrowings under the credit facility     $ 0 $ 5,200,000
Available borrowings     $ 17,600,000  
Revolving Credit Facility | Minimum        
Debt Instrument [Line Items]        
Margin on LIBOR rate     2.50%  
Revolving Credit Facility | Maximum        
Debt Instrument [Line Items]        
Margin on LIBOR rate     3.00%  
Letter of Credit        
Debt Instrument [Line Items]        
Maximum amount of credit facility   $ 3,000,000.0