Lease (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Finance lease cost components:
Amortization of finance lease assets	$ 17	$ 17
Interest on finance lease liabilities	11	16
Total finance lease costs	28	33
Operating lease cost components:
Operating lease cost	140	123
Variable lease cost	27	27
Short-term lease cost	2	22
Total operating lease costs	169	172
Total lease cost	$ 197	$ 205