Cumulative Redeemable Convertible Preferred Stock - Additional Information (Details) - USD ($)				12 Months Ended
	Jan. 12, 2018	Jul. 14, 2017	Jul. 20, 2016	Dec. 31, 2018
Class of Stock [Line Items]
Stock repurchased during period, shares		120,000
Payments for repurchase of preferred stock and preference stock		$ 4,100,000
Common stock shares held In escrow (in shares)		509,500
Debt instrument, repurchased face amount	$ 10,000,000
Debt instrument, unamortized premium	2,200,000
Dividends payable	$ 900,000
Preferred Stock
Class of Stock [Line Items]
Percentage required for preferred stock repurchase agreement		130.00%
Stock repurchased during period, shares	280,000	280,000
Redeemable Convertible Preferred Stock
Class of Stock [Line Items]
Conversion price (in usd per share)			$ 12.50
Preferred stock, dividend rate, year one through year three, percentage			8.00%
Preferred stock, dividend rate, year four through year five, percentage			10.00%
Preferred stock, dividend rate, after year five, percentage			12.00%
Adjustments to additional paid in capital reclassification of cumulative dividends on redeemable convertible preferred stock				$ 0
Series A Preferred Stock
Class of Stock [Line Items]
Stock issued during period, shares, acquisitions (in shares)			400,000
Stock conversion ratio			0.5
Percentage of proceeds from stock issuance to redeem preferred stock			30.00%