Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	50,000,000	50,000,000
Preferred stock, dividend rate, percentage	8.75%	8.75%
Preferred stock, liquidation preference, value (in dollars)	$ 25	$ 25
Preferred stock, shares issued	0	1,610,000
Preferred stock, shares outstanding (in shares)	0	1,610,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	450,000,000	450,000,000
Common stock, shares issued	23,687,664	23,687,664
Common stock, shares, outstanding	23,687,664	23,687,664
Collateralized loan obligation, discount	$ 2,170,488	$ 2,440,674
Collateralized loan obligation, deferred financing costs	3,550,489	$ 3,761,410
Debt issuance costs	$ 949,456