Equity - Additional Information (Details) - Common Shares [Member] - USD ($) $ / shares in Units, $ in Millions		12 Months Ended
	May 30, 2018	Dec. 31, 2018
Class Of Stock [Line Items]
Shares of common stock issued in public offering		4,600,000
Secondary Public Offering [Member]
Class Of Stock [Line Items]
Shares of common stock issued in public offering	4,600,000
Common stock sale price per share	$ 18.50
Net proceeds from sale of common stock in public offering	$ 79.5
Payments of offering costs	$ 0.5