Summary of Significant Accounting Policies - Additional Information (Detail)		3 Months Ended		6 Months Ended		12 Months Ended
	Dec. 02, 2020 USD ($)	Jun. 30, 2021 USD ($) Customer	Jun. 30, 2020 USD ($) Customer	Jun. 30, 2021 USD ($) Customer Vendor	Jun. 30, 2020 USD ($) Customer	Dec. 31, 2020 USD ($) Customer
Summary Of Significant Accounting Policies [Line Items]
Equity method investments		$ 0		$ 0		$ 0
Guarantee or other funding obligations under equity method investment		284,731,000		284,731,000		301,430,000
Earnings or losses from equity method investment		0	$ 0	0	$ 0
Revenue recognized from customer contracts		1,126,000		3,119,000
Remaining deferred revenues recognized					1,900,000
Note payable - related party		1,352,000		1,352,000		1,400,000
Revenues		65,353,000	$ 56,030,000	127,288,000	$ 122,003,000
Inventories finished goods and purchased parts		20,565,000		20,565,000		23,529,000
Inventories raw materials		$ 5,718,000		5,718,000		$ 6,458,000
impairment loss				6,656,000
Satellite Network [Member]
Summary Of Significant Accounting Policies [Line Items]
impairment loss				$ 6,656,000
Revenues [Member] | Customer Concentration Risk [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of customers with revenues greater than 10% | Customer			0		0
Revenues [Member] | Customer Concentration Risk [Member] | Carrier Global Corporation [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration risk percentage		11.40%		12.00%
Number of customers with revenues greater than 10% | Customer		1
Revenues [Member] | Customer Concentration Risk [Member] | Sanmina Corporation [Member] | Mexico [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration risk percentage		77.70%	92.30%	81.90%	88.50%
Number of vendors | Vendor				1
Revenues		$ 22,057,000	$ 16,902,000	$ 44,491,000	$ 38,894,000
Accounts Receivable | Carrier Global Corporation [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration risk percentage				11.30%		10.80%
Number of customers with accounts receivable greater than 12% | Customer				1		1
Senior Secured Notes [Member]
Summary Of Significant Accounting Policies [Line Items]
Senior secured notes principal amount	$ 220,000
Maximum [Member] | Revenues [Member] | Customer Concentration Risk [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration risk percentage			10.00%		10.00%
ASU 2014-09 [Member]
Summary Of Significant Accounting Policies [Line Items]
Warranty period				1 year
Estimated life of communicator				3 years
ASU 2014-09 [Member] | Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Additional term of the agreement				2 years
ASU 2014-09 [Member] | Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Additional term of the agreement				5 years
Equity Method Investment, Guarantee or Other Funding [Member]
Summary Of Significant Accounting Policies [Line Items]
Guarantee or other funding obligations under equity method investment		$ 0	$ 0	$ 0	$ 0