Commitments and Contingencies (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Contingencies And Commitments [Line Items]
Investments in affiliates	$ 59,989,000		$ 24,574,000
Sublease income	0	$ 0
Operating lease payments	$ 159,139
Operating lease, term of contract	1 year 3 months
Operating lease, discount rate	7.50%
Sale of SSL, Nov. 02, 2012 [Member] | Pre Closing Taxes Indemnification [Member]
Contingencies And Commitments [Line Items]
Indemnification refund receivable	$ 2,400,000		2,400,000
Globalstar do Brasil S.A. [Member]
Contingencies And Commitments [Line Items]
Loss contingency accrual	$ 200,000		$ 200,000