Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Sep. 30, 2019	Dec. 31, 2019	Jan. 01, 2019
Contingencies And Commitments [Line Items]
Operating lease liability	$ 839
Right-of-use asset	831			$ 988	$ 300
Sublease income	0	$ 0
Operating lease payments	$ 200
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	$ 600			600
Indemnification refund received			$ 1,800
Globalstar do Brasil S.A. [Member]
Contingencies And Commitments [Line Items]
Loss contingency accrual	$ 100			$ 100
Restatement Adjustment [Member] | Accounting Standards Update 2016-02 [Member]
Contingencies And Commitments [Line Items]
Operating lease liability					300
Right-of-use asset					$ 300