Lease (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Finance lease cost components:
Amortization of finance lease assets	$ 17
Interest on fiance lease liabilities	16
Total finance lease costs	33
Operating lease cost components:
Operating lease cost	123
Variable lease cost	27
Short-term lease cost	22
Total operating lease costs	172
Total lease cost	$ 205