XML 166 R151.htm IDEA: XBRL DOCUMENT v3.20.4
Selected Quarterly Financial Data (Unaudited) - Gain on Lease Modification (Details) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Apr. 30, 2019
Dec. 31, 2019
Selected Quarterly Financial Data    
Gain on lease modification $ 3,200 $ 3,169