Summary of Significant Accounting Policies (Details) $ / shares in Units, shares in Thousands, $ in Thousands		9 Months Ended
	Feb. 28, 2018 USD ($) $ / shares shares	Sep. 30, 2018 USD ($) hub	Sep. 30, 2017 USD ($)
Accounting Policies [Line Items]
Stock Issued During Period, Shares, Treasury Stock Reissued | shares	377
Sale of Stock, Price Per Share | $ / shares	$ 11.95
Proceeds from Sale of Treasury Stock | $	$ 4,500	$ 4,500	$ 0
Satellite hubs for HTS network [Member]
Accounting Policies [Line Items]
Lessee, Operating Lease, Term of Contract		5 years
Number of satellite hubs leased | hub		3