Annual report pursuant to Section 13 and 15(d)

Convertible Debt - Additional Information (Details)

v3.6.0.2
Convertible Debt - Additional Information (Details) - USD ($)
12 Months Ended
May 23, 2016
Jun. 29, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]          
Deferred debt financing costs, net     $ 3,132,050 $ 4,187,271  
Repurchases of convertible debt $ 1,000,000   899,960 0 $ 0
Convertible Senior Notes Due 2020 [Member]          
Debt Instrument [Line Items]          
Amount of underwriter's discount     2,586,166 3,356,847  
Convertible Debt [Member]          
Debt Instrument [Line Items]          
Interest expense     8,800,842 $ 4,472,031  
Amount of underwriter's discount     3,700,000    
Deferred debt financing costs, net     $ 241,000    
Effective percentage     7.70% 7.70%  
Gain on extinguishment of debt $ 72,000        
Convertible Debt [Member] | Convertible Senior Notes Due 2020 [Member]          
Debt Instrument [Line Items]          
Face amount   $ 115,000,000 $ 115,000,000    
Interest Rate   7.00% 7.00% 7.00%  
Interest expense     $ 8,008,195 $ 4,069,722  
Principal amount   $ 1,000      
Percentage of principal amount redeemed   100.00%      
Common Stock [Member] | Convertible Debt [Member] | Convertible Senior Notes Due 2020 [Member]          
Debt Instrument [Line Items]          
Shares issued (in shares)   30.3030      
Conversion price (in dollars per share)   $ 33.0