Leases - Changes in ROU assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Jan. 01, 2019
Changes in operating lease right-of-use asset
New operating lease right-of-use asset	$ 401
Amortization of right-of-use asset during the nine-month period ending September 30, 2019	(198)
Operating lease right-of use asset	524	$ 321
Operating lease expenses	$ 277