Summary of Significant Accounting Policies - Additional Information (Detail)	3 Months Ended	12 Months Ended
	Sep. 30, 2017 USD ($)	Dec. 31, 2019 USD ($) Satellite Customer Vendor Segment	Dec. 31, 2018 USD ($) Customer	Dec. 31, 2017 USD ($)	Jan. 01, 2019 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Equity method investments		$ 0	$ 0
Guarantee or other funding obligations under equity method investment		0	0	$ 0
Earnings or losses from equity method investment		0	0	0
Acquisition-related and integration costs		788,000	1,624,000	3,315,000
Revenue recognized from customer contracts		$ 5,896,000	5,236,000
Number of satellite networks buying network connectivity | Customer		2
Number of terrestrial network partners buying network connectivity | Customer		7
Foreign currency translation gain (loss)		$ (84,000)	(76,000)	(4,000)
Note payable - related party		1,275,000	1,298,000
Cash and cash equivalents		$ 54,258,000	$ 53,766,000
Number of customers with revenues greater than 10% | Customer		0	0
Number of customers with accounts receivable greater than 10% | Customer		0	0
Revenues		$ 266,254,000	$ 270,607,000	247,880,000
Inventories finished goods and purchased parts		33,379,000	27,701,000
Inventories raw materials		$ 6,502,000	6,599,000
Impairment loss - satellite network				31,224,000
Number of reporting segments | Segment		1
Goodwill impairment charges		$ 0	$ 0	$ 0
Maximum percentage of benefit realized upon ultimate settlement		50.00%
Right-of-use assets		$ 15,894,000
Lease liabilities		$ 18,874,000
Revenues [Member] | Customer Concentration Risk [Member] | JB Hunt Transport Services, Inc. [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration risk percentage				10.80%
Revenues [Member] | Customer Concentration Risk [Member] | Sanmina Corporation [Member] | Mexico [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration risk percentage		67.40%	60.00%
Number of vendors | Vendor		1
Revenues		$ 75,068,000	$ 73,476,000
Gateway Earth Stations [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of assets operated communications and broadcasting equipment | Satellite		15
AIS Data Reception Earth Stations [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of assets operated communications and broadcasting equipment | Satellite		3
Regional Gateway Control Centers [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of assets operated communications and broadcasting equipment | Satellite		3
OG2 Satellite [Member]
Summary Of Significant Accounting Policies [Line Items]
Impairment loss - satellite network	$ 31,224,000			$ 31,224,000
Satellite Network [Member]
Summary Of Significant Accounting Policies [Line Items]
Impairment loss on asset		$ 0	$ 0
Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Amortization of internal use software costs, useful life		3 years
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Amortization of internal use software costs, useful life		7 years
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
ASU 2016-02 [Member]
Summary Of Significant Accounting Policies [Line Items]
Right-of-use assets					$ 10,892,000
Lease liabilities					$ 13,825,000