Summary of Significant Accounting Policies - Restricted Cash (Details)	3 Months Ended	12 Months Ended
	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2017 item
Summary of Significant Accounting Policies
Number of beds damaged | item			170
Gross value of damaged property		$ 2,021,000
Carrying value of damaged property		1,133,000
Insurance proceeds	$ 2,619,000	$ 2,619,000