Leases - Balance Sheet Information (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019
Leases [Abstract]
Operating lease right-of-use asset	$ 2,746	$ 2,800
Other current liabilities	395
Operating lease liabilities	2,512
Total operating lease liabilities	2,907	$ 3,000
Property, plant, and equipment	81
Accumulated depreciation	(3)
Property, plant, and equipment, net	78
Other current liabilities	12
Other long-term liabilities	67
Total finance lease liabilities	$ 79