Other Current Assets and Other Accrued Expenses - Other Accrued Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Other Assets And Other Accrued Expenses Disclosure [Abstract]
Accrued pricing discounts	$ 781	$ 1,011
Other	2,837	1,357
Other accrued expenses	$ 3,618	$ 2,368