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Related Party Transactions - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 29, 2020 | Oct. 01, 2020 | Dec. 31, 2020 | Dec. 18, 2020 | Mar. 31, 2018
MAST Capital Management, LLC |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Percentage of ownership interest issued to former owner/holder |  |  | 7.60% |  |
GE FM Holdings |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Percentage of ownership interest issued to former owner/holder |  |  |  |  | 19.90%
GECC |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Percentage of ownership interest (as a percent) |  |  | 23.60% |  |
Equity method investment aggregate shares received |  | 2,966,531 |  |  |
Equity method investment, share price |  | $ 2.95 |  |  |
Equity method investment, aggregate value |  | $ 8,800 |  |  |
J.P. Morgan Broker-Dealer Holdings Inc. and JPMorgan Chase & Co | Ligado Networks, LLC |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Business combination, common stock interest, percentage |  |  |  | 21.00% |
J.P. Morgan Broker-Dealer Holdings Inc. and JPMorgan Chase & Co | Forest Merger Sub Inc |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Proceeds from issuance of common stock | $ 35,000 |  |  |  |
Issuance of Forest preferred stock | $ 2,700 |  |  |  |
Shared Personnel and Reimbursement Agreement | Jason W. Reese | Investment Management Expenses |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Costs incurred under agreement |  |  | $ 100 |  |
Consolidated Fund |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Percentage of investment in consolidated fund had fair value of greater than of consolidated assets |  |  | 5.00% |  |
Receivable for reimbursable expenses paid |  |  | $ 10 |  |

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