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Series B Mandatorily Redeemable Preferred Stock (Details) - USD ($)
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jul. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Jun. 30, 2017
Dec. 31, 2018
Dec. 31, 2015
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]            
Interest expense   $ 2,545,203 $ 3,076,976      
Preferred stock extend redemption date Aug. 01, 2019     Aug. 01, 2018    
Preferred stock redemption extension fee paid       $ 153,500    
Preferred stock redemption extension additional fee paid $ 153,500          
Redeemable Convertible Preferred Stock Series B [Member]            
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]            
Preferred stock shares issued (in shares)   16,000     16,900 35,000
Preferred stock shares outstanding (in shares)   16,000     16,900  
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, preferred return on funds invested   14.00%        
Deferred financing costs   $ 3,100,000        
Interest expense   61,000 $ 19,000      
Total unamortized deferred costs   $ 61,000     $ 122,000  
Number of shares redeemed   900     13,800  
Number of shares redeemed, value   $ 900,000     $ 13,800,000  
Redeemable preferred stock   $ 16,000,000     $ 16,900,000