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Series B Mandatorily Redeemable Preferred Stock (Details) - USD ($)
 1 Months Ended 3 Months Ended 12 Months Ended
Aug. 31, 2016
Jul. 31, 2016
Jun. 30, 2016
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]              
Interest expense       $ 3,316,196 $ 3,388,602    
Preferred stock, redemption date       Aug. 01, 2017      
Scheduled payments due in 2017       $ 31,700,000      
Redemption date at a cost of per extension       0.05%      
Redeemable Convertible Preferred Stock Series B [Member]              
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]              
Preferred stock shares issued (in shares)       31,700   32,700 35,000
Preferred stock, par or stated value (in dollars per share)       $ 0.01   $ 0.01  
Liquidation preference per share (in dollars per share)       $ 1,000   $ 1,000  
Financial Instruments Subject to Mandatory Redemption, Return On Funds Invested       14.00%      
Deferred financing costs       $ 3,100,000      
Interest expense       254,000 $ 254,000    
Total unamortized deferred stock costs       $ 338,000   $ 592,000  
Number of shares redeemed 1,000 1,000 300 1,000      
Number of shares redeemed, value       $ 1,000,000   $ 2,300,000  
Preferred stock shares outstanding (in shares)       31,700   32,700