Leases (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
Weighted Average Remaining Lease Term [Abstract]
Operating leases	4 years 1 month 6 days	4 years 1 month 6 days
Finance leases	9 years 9 months 18 days	9 years 9 months 18 days
Weighted Average Discount Rate [Abstract]
Operating leases	5.75%	5.75%
Finance leases	5.04%	5.04%
Operating Leases, Right-of-Use Assets and Lease Liabilities [Abstract]
Right-of-use asset	$ 1,727	$ 1,727	$ 0
Operating lease liabilities, non-current	1,454	1,454	$ 0
Future Minimum Lease Commitments [Abstract]
2019 (excluding the six months ended June 30, 2019)	285	285
2020	564	564
2021	551	551
2022	395	395
2023	340	340
2024 and thereafter	28	28
Total lease payments	2,163	2,163
Less imputed interest	(237)	(237)
Total	1,926	1,926
Finance Lease Liabilities, Payments, Due [Abstract]
2019 (excluding the six months ended June 30, 2019)	1,008	1,008
2020	2,045	2,045
2021	2,096	2,096
2022	2,149	2,149
2023	2,203	2,203
2024 and thereafter	12,917	12,917
Total lease payments	22,418	22,418
Less imputed interest	(4,979)	(4,979)
Total	17,439	17,439
Lease, Cost [Abstract]
Operating lease cost	147	294
Finance lease cost [Abstract]
Amortization of right-of-use assets	305	610
Interest on lease liabilities	222	447
Total finance lease cost	$ 527	1,057
Cash paid for amounts included in the measurement of lease liabilities: [Abstract]
Cash flows from operating activities - operating leases		261
Cash flows from operating activities - finance leases		987
Right-of-use assets obtained in exchange for lease obligations: [Abstract]
Operating leases		$ 245