Property, Plant, and Equipment, Net - Construction in Progress (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Construction in progress	$ 3,598	$ 5,556
Machinery and equipment
Property, Plant and Equipment [Line Items]
Construction in progress	1,428	2,444
Tooling and equipment
Property, Plant and Equipment [Line Items]
Construction in progress	759	1,581
Leasehold and building improvements
Property, Plant and Equipment [Line Items]
Construction in progress	574	675
Software
Property, Plant and Equipment [Line Items]
Construction in progress	518	352
Other
Property, Plant and Equipment [Line Items]
Construction in progress	$ 319	$ 504