Segment Information - Schedule of Revenue by Principal Product Lines (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Entity Wide Information Revenue From External Customer [Line Items]
Revenue	$ 34,339	$ 32,027	$ 31,098
Automotive
Entity Wide Information Revenue From External Customer [Line Items]
Revenue	18,235	10,849	4,773
Security Surveillance
Entity Wide Information Revenue From External Customer [Line Items]
Revenue	$ 16,104	$ 21,178	$ 26,325