Annual report pursuant to Section 13 and 15(d)

Segments - Schedule of Activities with Major Customers (Details)

v3.10.0.1
Segments - Schedule of Activities with Major Customers (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
customer
Dec. 31, 2017
USD ($)
Dec. 31, 2016
Segment Reporting [Abstract]      
Number of major customers | customer 2    
Panasonic | Customer Concentration Risk | Consolidated Revenue      
Revenue, Major Customer      
Percent of consolidated revenue 14.40% 19.10% 21.60%
Panasonic | Customer Concentration Risk | Accounts Receivable      
Revenue, Major Customer      
Accounts receivable $ 14,994 $ 10,200  
Boeing | Customer Concentration Risk | Consolidated Revenue      
Revenue, Major Customer      
Percent of consolidated revenue 14.30% 16.80% 15.20%
Boeing | Customer Concentration Risk | Accounts Receivable      
Revenue, Major Customer      
Accounts receivable $ 24,649 $ 12,969