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Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Net sales	$ 42,292	$ 36,568
Mobile connectivity product sales | Mobile connectivity | Transferred at point in time
Disaggregation of Revenue [Line Items]
Net sales	6,088	5,986
Mobile connectivity product sales | Mobile connectivity | Transferred over time
Disaggregation of Revenue [Line Items]
Net sales	803	606
Mobile connectivity service | Mobile connectivity
Disaggregation of Revenue [Line Items]
Net sales	23,616	22,304
Inertial navigation product | Inertial navigation
Disaggregation of Revenue [Line Items]
Net sales	11,541	6,502
Inertial navigation service | Inertial navigation
Disaggregation of Revenue [Line Items]
Net sales	$ 244	$ 1,170

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Amount, excluding 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.

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