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Revenue from Contracts with Customers (ASC 606) - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Revenue from External Customer [Line Items]
Total net sales	$ 158,733	$ 157,893
Product
Revenue from External Customer [Line Items]
Total net sales	64,619	61,925
Service
Revenue from External Customer [Line Items]
Total net sales	94,114	95,968
Mobile Connectivity | Service
Revenue from External Customer [Line Items]
Total net sales	91,590	90,392
Intertial Navigation | Product
Revenue from External Customer [Line Items]
Total net sales	36,756	30,302
Intertial Navigation | Service
Revenue from External Customer [Line Items]
Total net sales	2,524	5,576
Transferred at point in time | Mobile Connectivity | Product
Revenue from External Customer [Line Items]
Total net sales	25,140	26,419
Transferred over time | Mobile Connectivity | Product
Revenue from External Customer [Line Items]
Total net sales	$ 2,723	$ 5,204

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Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

+ References

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