Leases (Details Textual) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Operating Leased Assets [Line Items]
Operating lease, right-of-use asset	$ 1,031		$ 1,106
Operating lease, liability	1,031
Lease reassessment right of use assets and lease liabilities	67	$ 0
Right of use assets and lease liabilities	$ 135	$ 1,362
Minimum
Operating Leased Assets [Line Items]
Lessee, operating lease, discount rate	4.00%
Operating ​lease, ​remaining​ lease ​term	3 years
Maximum
Operating Leased Assets [Line Items]
Lessee, operating lease, discount rate	6.00%
Operating ​lease, ​remaining​ lease ​term	4 years