| Segments - Schedule of Activities with Major Customers (Details) $ in Thousands | 12 Months Ended | ||
|---|---|---|---|
| Dec. 31, 2019  USD ($)  customer | Dec. 31, 2018  USD ($) | Dec. 31, 2017 | |
| Segment Reporting [Abstract] | |||
| Number of major customers | customer | 2 | ||
| Panasonic | Customer Concentration Risk | Consolidated Revenue | |||
| Revenue, Major Customer | |||
| Percent of consolidated revenue | 13.00% | 14.40% | 19.10% | 
| Panasonic | Customer Concentration Risk | Accounts Receivable, Net | |||
| Revenue, Major Customer | |||
| Accounts receivable | $ 15,831 | $ 14,994 | |
| Boeing | Customer Concentration Risk | Consolidated Revenue | |||
| Revenue, Major Customer | |||
| Percent of consolidated revenue | 13.60% | 14.30% | 16.80% | 
| Boeing | Customer Concentration Risk | Accounts Receivable, Net | |||
| Revenue, Major Customer | |||
| Accounts receivable | $ 21,806 | $ 24,649 | |
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- Definition Number of major customers. No definition available. 
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- Definition Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available. 
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