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Debt Obligations, Convertible Senior Unsecured Notes (Details) - Convertible Senior Unsecured Notes - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Oct. 31, 2016
Sep. 30, 2017
Sep. 30, 2017
Dec. 31, 2016
Jan. 31, 2017
Debt Obligations          
Principal amount $ 86,300,000 $ 100,000,000 $ 100,000,000 $ 86,250,000 $ 100,000,000
Additional principal amount         $ 13,800,000
Interest rate (as a percent) 6.50% 6.50% 6.50%    
Proceeds received, net of estimated issuance costs $ 95,800,000        
Percentage of the Notes required to be repurchased if the agreement is fundamentally changed 100.00%        
Conversion rate of the notes to common stock, per $1,000 principal amount of notes 119.3033   120.0428    
Conversion price per share of common stock $ 8.38 $ 8.33 $ 8.33    
Nonconvertible debt borrowing rate at the time of issuance (as a percent)     7.50%    
Maturity period (in years)     2 years 2 years 9 months  
Unamortized Debt Discount   $ 1,809,470 $ 1,809,470 $ 2,119,436  
Unamortized Deferred Financing Fees   2,809,409 2,809,409 3,470,526  
Net Carrying Value, Liability Component   95,381,121 95,381,121 80,660,038  
Net Carrying Value, Equity Component     2,531,926 $ 2,178,647  
Total interest expense   2,200,000 6,600,000    
Interest expense related to cash coupon   1,600,000 4,800,000    
Deferred fees expensed as interest expense   400,000 1,100,000    
Debt discount   $ 200,000 $ 700,000    
Cost of the notes (as a percent)   8.68% 8.68%    
Over-Allotment Option          
Debt Obligations          
Principal amount $ 11,300,000