Leases - Balance Sheet Information (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019
Leases [Abstract]
Operating lease right-of-use asset	$ 2,656	$ 1,900
Other current liabilities	409
Operating lease liabilities	2,421
Total operating lease liabilities	2,830	$ 2,000
Property, plant, and equipment	81
Accumulated depreciation	(6)
Property, plant, and equipment, net	75
Other current liabilities	12
Other long-term liabilities	64
Total finance lease liabilities	$ 76