Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Thousands			12 Months Ended
	Jan. 13, 2020	Oct. 22, 2018	Dec. 31, 2018
Subsequent Events
Net proceeds			$ 58,084
Over-Allotment Option [Member]
Subsequent Events
Number of ordinary shares issued		997,500
Subsequent Events
Subsequent Events
Number of ordinary shares issued	6,900,000
Public offering price per share	$ 5.00
Net proceeds	$ 31,800
Subsequent Events | Over-Allotment Option [Member]
Subsequent Events
Number of ordinary shares issued	900,000