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Intangible Assets (Narrative) (Details) - USD ($) $ in Thousands | 1 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Feb. 28, 2021 | Dec. 31, 2021 | Mar. 31, 2021
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |
Initial Deposits |  | $ 5,900 | $ 2,300
Gain (loss) from disposal of intangible assets, net |  | 10,200 |
Prepaid expenses and other current assets |  | 7,269 | 3,508
Other assets |  | 1,675 | 1,214
Wireless Licenses [Member] |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |
Asset Acquisition, Consideration Transferred |  | 12,100 |
Prepaid Expenses and Other Current Assets [Member] |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |
Initial Deposits |  | 5,500 | 1,900
Other Assets [Member] |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |
Initial Deposits |  | 400 | 400
New Wireless Licenses [Member] |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |
Estimated fair value |  | 13,600 |
Narrowband Licenses [Member] |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |
Amount disposed |  | 3,400 |
SDG&E [Member] |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |
Asset Acquisition, Consideration Transferred | $ 50,000 |  |
Third Parties [Member] | Wireless Licenses [Member] |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |
Asset Acquisition, Consideration Transferred |  | 10,100 |
Anti-Windfall [Member] | Wireless Licenses [Member] |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |
Asset Acquisition, Consideration Transferred |  | 2,000 |
In-Process Deals [Member] |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |
Prepaid Expense And Other Assets Current And Noncurrent |  | 800 | 400
Prepaid expenses and other current assets |  | 100 | 100
Other assets |  | $ 700 | $ 300

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