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Revenue from Contracts with Customers (ASC 606) - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Net sales	$ 43,363	$ 36,926	$ 85,655	$ 73,494
Mobile connectivity product sales | Mobile connectivity | Transferred at point in time
Disaggregation of Revenue [Line Items]
Net sales	7,292	6,080	13,380	12,066
Mobile connectivity product sales | Mobile connectivity | Transferred over time
Disaggregation of Revenue [Line Items]
Net sales	754	623	1,557	1,229
Mobile connectivity service | Mobile connectivity
Disaggregation of Revenue [Line Items]
Net sales	25,709	22,483	49,325	44,787
Inertial navigation product | Inertial navigation
Disaggregation of Revenue [Line Items]
Net sales	9,223	7,246	20,764	13,748
Inertial navigation service | Inertial navigation
Disaggregation of Revenue [Line Items]
Net sales	$ 385	$ 494	$ 629	$ 1,664

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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.

+ References

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