Leases (Details Textual) - USD ($)	Jun. 30, 2019	Dec. 31, 2018
Operating Leased Assets [Line Items]
Lessee, operating lease, discount rate	6.00%
Operating lease, right-of-use asset	$ 1,238,000	$ 0
Operating lease, liability	$ 1,238,000
Minimum
Operating Leased Assets [Line Items]
Operating lease remaining lease term (in years)	3 years
Maximum
Operating Leased Assets [Line Items]
Operating lease remaining lease term (in years)	5 years