Anterix (ATEX) 10-K 14 Jun 23 2023 FY Annual report Financial data

Cover

Cover - USD ($)	12 Months Ended
	Mar. 31, 2023	Jun. 09, 2023	Sep. 30, 2022
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Mar. 31, 2023
Current Fiscal Year End Date	--03-31
Document Transition Report	false
Entity File Number	001-36827
Entity Registrant Name	Anterix Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	33-0745043
Entity Address, Address Line One	3 Garret Mountain Plaza
Entity Address, Address Line Two	Suite 401
Entity Address, City or Town	Woodland Park,
Entity Address, State or Province	NJ
Entity Address, Postal Zip Code	07424
City Area Code	973
Local Phone Number	771-0300
Title of 12(b) Security	Common Stock, $0.0001 par value
Trading Symbol	ATEX
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 476,669,934
Entity Common Stock, Shares Outstanding		19,042,634
Documents Incorporated by Reference	Portions of the registrant’s definitive proxy statement to be filed with the Securities and Exchange Commission pursuant to Regulation 14A in connection with the registrant’s 2023 Annual Meeting of Stockholders, which will be filed subsequent to the date hereof, are incorporated by reference into Part III of this Form 10-K where indicated. Such definitive proxy statement will be filed with the Securities and Exchange Commission no later than 120 days following the end of the registrant’s fiscal year ended March 31, 2023.
Document Fiscal Year Focus	2023
Amendment Flag	false
Document Fiscal Period Focus	FY
Entity Central Index Key	0001304492

Audit Information

Audit Information	12 Months Ended
	Mar. 31, 2023
Auditor Information [Abstract]
Auditor Firm ID	248
Auditor Name	GRANT THORNTON LLP
Auditor Location	New York, New York

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2023	Mar. 31, 2022
Current Assets
Cash and cash equivalents	$ 43,182	$ 105,624
Prepaid expenses and other current assets	16,277	10,147
Total current assets	59,459	115,771
Property and equipment, net	3,606	2,949
Right of use assets, net	3,371	4,047
Intangible assets	202,044	151,169
Other assets	10,078	4,108
Total assets	278,558	278,044
Current liabilities
Accounts payable and accrued expenses	6,624	6,526
Due to related parties	533	120
Operating lease liabilities	1,725	1,512
Deferred revenue	2,769	1,478
Contingent liability	20,249	0
Total current liabilities	31,900	9,636
Operating lease liabilities	2,922	4,177
Contingent liability	0	20,000
Deferred revenue	57,990	53,200
Deferred income tax	5,440	4,192
Other liabilities	513	541
Total liabilities	98,765	91,746
Commitments and contingencies
Stockholders’ equity
Preferred stock, $0.0001 par value per share, 10,000,000 shares authorized and no shares outstanding at March 31, 2023 and March 31, 2022	0	0
Common stock, $0.0001 par value per share, 100,000,000 shares authorized and 18,921,999 shares issued and outstanding at March 31, 2023 and 18,377,483 shares issued and outstanding at March 31, 2022	2	2
Additional paid-in capital	518,160	500,125
Accumulated deficit	(338,369)	(313,829)
Total stockholders’ equity	179,793	186,298
Total liabilities and stockholders’ equity	$ 278,558	$ 278,044

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2023	Mar. 31, 2022
Statement of Financial Position [Abstract]
Preferred stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	18,921,999	18,377,483
Common stock, shares outstanding (in shares)	18,921,999	18,377,483

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($)	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Operating revenues
Total operating revenues	$ 1,919,000	$ 1,084,000	$ 921,000
Operating expenses
Direct cost of revenue (exclusive of depreciation and amortization)	0	5,000	1,606,000
General and administrative	45,177,000	39,525,000	39,302,000
Sales and support	5,733,000	4,461,000	2,942,000
Product development	4,439,000	3,593,000	4,343,000
Depreciation and amortization	1,420,000	1,450,000	3,533,000
Impairment of long-lived assets	0	0	85,000
Operating expenses	56,769,000	49,034,000	51,811,000
(Gain)/loss from disposal of intangible assets, net	(38,399,000)	(11,209,000)	3,849,000
Loss from disposal of long-lived assets, net	10,000	107,000	70,000
Loss from operations	(16,461,000)	(36,848,000)	(54,809,000)
Interest income	1,140,000	56,000	124,000
Other income	266,000	256,000	414,000
Loss on equity method investment	0	0	(39,000)
Loss before income taxes	(15,055,000)	(36,536,000)	(54,310,000)
Income tax expense	1,262,000	983,000	124,000
Net loss	$ (16,317,000)	$ (37,519,000)	$ (54,434,000)
Net loss per common share basic (in dollars per share)	$ (0.87)	$ (2.07)	$ (3.13)
Net loss per common share diluted (in dollars per share)	$ (0.87)	$ (2.07)	$ (3.13)
Weighted-average common shares used to compute basic net loss per share (in shares)	18,841,049	18,142,828	17,412,958
Weighted-average common shares used to compute diluted net loss per share (in shares)	18,841,049	18,142,828	17,412,958
Service revenue
Operating revenues
Total operating revenues	$ 0	$ 0	$ 192,000
Spectrum revenue
Operating revenues
Total operating revenues	$ 1,919,000	$ 1,084,000	$ 729,000

Consolidated Statements of Stoc

Consolidated Statements of Stockholders’ Equity - USD ($) $ in Thousands		Total	Common stock	Additional paid-in capital	Accumulated deficit
Beginning balance (in shares) at Mar. 31, 2020			17,185,000
Beginning balance at Mar. 31, 2020		$ 245,066	$ 2	$ 450,978	$ (205,914)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity based compensation		16,121		16,121
Restricted shares issued (in shares)			249,000
Stock option exercises (in shares)			208,000
Stock option exercises		4,218		4,218
Equity payment of prior year accrued employee related expenses (in shares)			28,000
Equity payment of prior year accrued employee related expenses		1,537		1,537
Net loss		(54,434)			(54,434)
Ending balance (in shares) at Mar. 31, 2021			17,670,000
Ending balance at Mar. 31, 2021		212,508	$ 2	472,854	(260,348)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity based compensation		13,725		13,725
Restricted shares issued (in shares)			226,000
Stock option exercises (in shares)	[1]		778,000
Stock option exercises	[1]	15,004		15,004
Shares withheld for taxes (in shares)			(24,000)
Shares withheld for taxes		(1,458)		(1,458)
Retirement of common stock (in shares)	[1]		(272,000)
Retirement of common stock	[1]	(15,962)			(15,962)
Net loss		(37,519)			(37,519)
Ending balance (in shares) at Mar. 31, 2022			18,378,000
Ending balance at Mar. 31, 2022		186,298	$ 2	500,125	(313,829)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity based compensation		17,874		17,874
Restricted shares issued (in shares)			219,000
Stock option exercises (in shares)			77,000
Stock option exercises		1,726		1,726
Motorola Shares (in shares)			500,000
Shares withheld for taxes (in shares)			(36,000)
Shares withheld for taxes		(1,565)		(1,565)
Retirement of common stock (in shares)			(216,000)
Retirement of common stock		(8,223)			(8,223)
Net loss		(16,317)			(16,317)
Ending balance (in shares) at Mar. 31, 2023			18,922,000
Ending balance at Mar. 31, 2023		$ 179,793	$ 2	$ 518,160	$ (338,369)
[1]Includes approximately $1.0 million, or 20,132 shares, received associated with a non-cash exercise of stock options and subsequent retirement. See Note 10 Stock Acquisition Rights, Stock Options and Warrants and Note 11 Supplemental Disclosure of Cash Flow Information for further discussion and disclosure.

Consolidated Statements of St_2

Consolidated Statements of Stockholders' Equity (Parenthetical) $ in Millions	1 Months Ended
	May 31, 2021 USD ($) shares
Statement of Stockholders' Equity [Abstract]
Shares repurchased | $	$ 1
Number of shares repurchased (in shares) | shares	20,132

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
CASH FLOWS FROM OPERATING ACTIVITIES
Net loss	$ (16,317,000)	$ (37,519,000)	$ (54,434,000)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities
Depreciation and amortization	1,420,000	1,450,000	3,533,000
Non-cash compensation expense attributable to stock awards	17,874,000	13,625,000	15,925,000
Deferred income taxes	1,248,000	983,000	124,000
(Gain)/loss from disposal of intangible assets, net	(38,399,000)	(11,209,000)	3,849,000
Loss from disposal of long-lived assets, net	10,000	107,000	70,000
Impairment of long-lived assets	0	0	85,000
Loss on equity method investment	0	0	39,000
Changes in operating assets and liabilities
Accounts receivable	0	4,000	57,000
Prepaid expenses and other assets	464,000	(797,000)	(745,000)
Right of use assets	676,000	1,053,000	1,407,000
Accounts payable and accrued expenses	101,000	270,000	2,647,000
Due to related parties	413,000	(32,000)	42,000
Restructuring reserve	0	0	(636,000)
Operating lease liabilities	(1,042,000)	(1,382,000)	(1,674,000)
Contingent liability	249,000	0	20,000,000
Deferred revenue	6,081,000	51,695,000	(483,000)
Other liabilities	(28,000)	(335,000)	235,000
Net cash (used in) provided by operating activities	(27,250,000)	17,913,000	(9,959,000)
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of intangible assets, including refundable deposits	(25,004,000)	(26,358,000)	(13,944,000)
Purchases of equipment	(2,126,000)	(1,053,000)	(230,000)
Net cash used in investing activities	(27,130,000)	(27,411,000)	(14,174,000)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from stock option exercises	1,726,000	14,004,000	4,218,000
Repurchase of common stock	(8,223,000)	(14,962,000)	0
Payments of withholding tax on net issuance of restricted stock	(1,565,000)	(1,458,000)	0
Net cash (used in) provided by financing activities	(8,062,000)	(2,416,000)	4,218,000
Net change in cash and cash equivalents	(62,442,000)	(11,914,000)	(19,915,000)
CASH AND CASH EQUIVALENTS
Beginning of the year	105,624,000	117,538,000	137,453,000
End of the year	$ 43,182,000	$ 105,624,000	$ 117,538,000

Nature of Operations

Nature of Operations	12 Months Ended
	Mar. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Operations	Nature of Operations Anterix Inc. (the “Company”) is a wireless communications company focused on commercializing its spectrum assets to enable its targeted utility and critical infrastructure customers to deploy private broadband networks and on offering innovative broadband solutions to the same target customers. The Company is the largest holder of licensed spectrum in the 900 MHz band (896 - 901 / 935 - 940 MHz) with nationwide coverage throughout the contiguous United States, Hawaii, Alaska and Puerto Rico. On May 13, 2020, the FCC approved the Report and Order (the “Report and Order”) to modernize and realign the 900 MHz band to increase its usability and capacity by allowing it to be utilized for the deployment of broadband networks, technologies and solutions. The Report and Order was published in the Federal Register on July 16, 2020, and became effective on August 17, 2020. The Company is now engaged in qualifying for and securing broadband licenses from the FCC. At the same time, the Company is pursuing opportunities to monetize the broadband spectrum it secures to its targeted utility and critical infrastructure customers. The Company was originally incorporated in California in 1997 and reincorporated in Delaware in 2014. In November 2015, the Company changed its name from Pacific DataVision, Inc. to pdvWireless, Inc. In August 2019, the Company changed its name from pdvWireless, Inc. to Anterix Inc. The Company maintains offices in Woodland Park, New Jersey, McLean, Virginia and Abilene, Texas. Business Developments On October 28, 2022, the Company entered into an agreement with Xcel Energy Services Inc. (“Xcel Energy”) providing Xcel Energy dedicated long-term usage of the Company’s 900 MHz Broadband Spectrum for a term of 20 years throughout Xcel Energy’s service territory in eight states (the “Xcel Energy Agreement”). The Xcel Energy Agreement also provides Xcel Energy an option to extend the agreement for two 10-year terms for additional payments. The Xcel Energy Agreement allows Xcel Energy to deploy a PLTE network to support its grid modernization initiatives for the benefit of its approximately 3.7 million electricity customers and 2.1 million natural gas customers. The scheduled prepayments for the 20-year initial term of the Xcel Energy Agreement total $80.0 million, of which $8.0 million was received by the Company in December 2022. See Note 3 Revenue for further discussion on the Xcel Energy Agreement. In September 2021, the Company entered into a long-term lease agreement of 900 MHz Broadband Spectrum with Evergy, Inc. (“Evergy”), (the “Evergy Agreement”). The Evergy service territories covered by the Evergy Agreement are in Kansas and Missouri with a population of approximately 3.9 million people. The Evergy Agreement is for an initial term of 20 years with two 10-year renewal options for additional payments. The Company received full prepayment of $30.2 million for the initial 20-year term in October 2021. During the year ended March 31, 2023, the Company delivered to Evergy the 1.4 x 1.4 cleared 900 MHz Broadband Spectrum and the associated broadband licenses for 81 counties. The revenue recognized for the year ended March 31, 2023 was approximately $0.6 million. See Note 3 Revenue for further discussion on the Evergy Agreement. In February 2021, the Company entered into an agreement with San Diego Gas & Electric Company, a subsidiary of Sempra Energy (“SDG&E”), to provide 900 MHz Broadband Spectrum throughout SDG&E’s California service territory, including San Diego and Imperial Counties and portions of Orange County for a total payment of $50.0 million. The total payment of $50.0 million is comprised of an initial payment of $20.0 million received in February 2021 and the remaining $30.0 million payment, which is due through fiscal year 2024 as the Company delivers the associated broadband licenses to SDG&E and the relevant cleared 900 MHz Broadband Spectrum. In September 2022, the Company delivered to SDG&E 1.4 x 1.4 cleared 900 MHz Broadband Spectrum and the associated broadband license related to Imperial County and received a milestone payment of $0.2 million. See Note 12 Contingencies for further discussion.

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Mar. 31, 2023
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Basis of Presentation and Use of Estimates The consolidated financial statements and accompanying notes are prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”), which require management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. The most significant estimates relate to estimated useful lives of depreciable assets, asset retirement obligations, valuation allowance on the Company’s deferred tax assets and recoverability of intangible assets. The Company is also required to make certain estimates with regard to the valuation of awards and forfeiture rates for its share-based award programs. Estimates and assumptions are reviewed periodically, and the effects of revisions are reflected in the financial statements in the applicable period. Accordingly, actual results could materially differ from those estimates. The accompanying consolidated financial statements include the accounts of the Company and its subsidiaries, including PDV Spectrum Holding Company, LLC formed in April 2014. All significant intercompany accounts and transactions have been eliminated in consolidation. Cash and Cash Equivalents All highly liquid investments with maturities of three months or less at the time of purchase are considered cash equivalents. Cash equivalents are stated at cost, which approximates the quoted market value and includes amounts held in money market funds. Concentrations of Credit Risk Financial instruments which potentially expose the Company to concentrations of credit risk consist primarily of cash and cash equivalents. The cash balance at times may exceed federally insured limits, however, the Company places its cash and temporary cash investments with financial institutions for which credit loss is not anticipated. As of March 31, 2023 and 2022, substantially all of the Company’s cash balance exceeded the federally insured limits. For the year ended March 31, 2023, the Company’s operating revenue was entirely from Motorola, Ameren, and Evergy as discussed in Note 3 Revenue . For the year ended March 31, 2022, the Company’s operating revenue was entirely from Motorola and Ameren as discussed in Note 3 Revenue . For the year ended March 31, 2021, the Company had one Tier 1 domestic carrier and one reseller that accounted for approximately 17% of total operating revenues, respectively. As of March 31, 2023 and March 31, 2022, the Company does not have an outstanding accounts receivable balance. Allowance for Doubtful Accounts An allowance for uncollectible receivables is estimated, as required, based on a combination of write-off history, aging analysis and any specific known troubled accounts. The Company reviews its allowance for uncollectible receivables on a quarterly basis. Past due balances meeting specific criteria are reviewed individually for collectability. In connection with the Company’s adoption of ASU 2016-13, Measurement of Credit Losses on Financial Instruments (“ASU 2016-13”), as discussed below, the Company will continue to monitor its credit loss exposure based on the write-off history, current conditions and future forecasts on the collectability of the accounts. Property and Equipment Property and equipment are stated at cost. Depreciation is computed using the straight-line method over the shorter of the estimated useful lives of the assets or the applicable lease term. The carrying amount at the balance sheet date of long-lived assets under construction in process includes assets purchased, constructed, or being developed internally that are not yet in service. Depreciation commences when the assets are placed in service. Depreciation rates for assets are updated periodically to account for changes, if any, in the estimated useful lives of the assets, lease terms, management’s strategic objectives, estimated residual values or obsolescence. Changes in estimates will result in adjustments to depreciation expense prospectively. Accounting for Asset Retirement Obligations An asset retirement obligation is evaluated and recorded as appropriate on assets for which the Company has a legal obligation to retire. The Company records a liability for an asset retirement obligation and the associated asset retirement cost at the time the underlying asset is acquired and put into service. Subsequent to the initial measurement of the asset retirement obligation, the obligation is adjusted at the end of each period to reflect the passage of time and changes in the estimated future cash flows underlying the obligation, if any. Over time, the liability is accreted to its present value and the capitalized cost is depreciated over the estimated useful life of the asset. The Company entered into long-term leasing arrangements primarily for tower site locations. The Company constructed assets at these locations and, in accordance with the terms of many of these agreements, the Company is obligated to restore the premises to their original condition at the conclusion of the agreements, generally at the demand of the other party to these agreements. The Company recognizes the fair value of a liability for an asset retirement obligation and capitalizes that cost as part of the cost basis of the related asset, depreciating it over the useful life of the related asset. Upon settlement of the obligation, any difference between the cost to retire the asset and the recorded liability is recognized on the Company’s Consolidated Statements of Operations. As of March 31, 2023, the Company settled approximately $0.1 million of its obligation to restore the leased premises to its original condition and revised its asset retirement obligations accrual by $6,000 on estimated future cash flows. As of March 31, 2022, the Company settled approximately $0.1 million of its obligation to restore the leased premises to its original condition and revised its asset retirement obligations accrual by $17,000 on estimated future cash flows. Changes in the liability for the asset retirement obligations for the years ended March 31, 2023 and 2022 are summarized below (in thousands): 2023 2022 Balance at beginning of the year $ 626 $ 749 Liabilities settled (79) (109) Revision of estimate (6) (17) Accretion expense 2 3 Balance at end of the year 543 626 Less amount classified as current - included in accounts payable and accrued expenses 30 85 Noncurrent liabilities - included in other liabilities $ 513 $ 541 Intangible Assets Intangible assets are wireless licenses that are used to provide the Company with the exclusive right to utilize designated radio frequency spectrum to provide wireless communication services. While licenses are issued for only a fixed time, generally ten years, such licenses are subject to renewal by the FCC. License renewals have occurred routinely and at nominal cost in the past. There are currently no legal, regulatory, contractual, competitive, economic or other factors that limit the useful life of the Company’s wireless licenses. As a result, the Company has determined that the wireless licenses should be treated as an indefinite-lived intangible asset. The Company will evaluate the useful life determination for its wireless licenses each year to determine whether events and circumstances continue to support their treatment as an indefinite useful life asset. Evaluation of Indefinite-Lived Intangible Assets for Impairment Historically, wireless licenses were tested for impairment on an aggregate basis, consistent with the Company’s dispatch business at a national level. Effective for the year ended March 31, 2021 (“Fiscal 2021”), the Company determined that its unit of accounting should be based on geographic markets and deal markets. Unit of accounting of wireless licenses not associated with closed deals is based on geographic markets. Unit of accounting of wireless licenses associated with closed deals is based on the deal markets. The Company’s wireless licenses not associated with closed deals are tested for impairment based on the geographic markets, as the Company will be utilizing the existing wireless narrowband licenses, or broadband licenses if applicable, as part of facilitating broadband spectrum networks at a geographic market level. The Company’s wireless licenses associated with closed deals are tested for impairment based at the deal market level. The Company may elect to first perform a qualitative assessment to determine whether it is more likely than not that the fair value of an intangible asset is less than its carrying value. If the Company does not perform the qualitative assessment, or if the qualitative assessment indicates it is more likely than not that the fair value of the intangible asset is less than its carrying amount, the Company will calculate the estimated fair value of the intangible asset. If the estimated fair value of the spectrum licenses is lower than their carrying amount, an impairment loss is recognized. The Company will use a market-based approach to estimate fair value for impairment testing purposes. The valuation approach used to estimate fair value for the purpose of impairment testing requires management to use complex assumptions and estimates such as population, discount rates, industry and market considerations, long-term market equity risk, as well as other factors. These assumptions and estimates depend on our ability to accurately predict forward looking assumptions including successfully applying for broadband licenses, commercializing our 900 MHz Broadband Spectrum and properly estimating favorable deal terms over the life of the contract. For impairment testing, estimated fair value is determined using a market-based approach primarily using the 600 MHz auction price. As noted in the Report and Order, the FCC will use the spectrum price based on the average price paid in the FCC’s 600 MHz auction to calculate the Anti-Windfall Payments. During the year ended March 31, 2023 (“Fiscal 2023”), the Company shifted from a probability analysis approach to a more detailed approach with measurable qualitative metrics. The new approach, Demonstrated Intent (“DI”), determines how likely a deal is to close based on certain qualitative factors, like applying for an experimental license, entering into a request for proposal, joining certain utility board or publicly backing 900 MHz Broadband Spectrum and its application. As a result, the Company will utilize the DI scores on a go-forward basis for our impairment analysis. As of and for the year ended March 31, 2023, the Company performed a step one quantitative approach impairment test as of January 1, 2023, to determine if the fair value of the combined licenses by the associated geographical or deal market exceeds the carrying value for each geographical or deal market. During the year ended March 31, 2022 (“Fiscal 2022”), the Company changed the date of its annual impairment assessment from March 31, its fiscal year-end, to January 1. For the year ended March 31, 2022, the Company performed a step zero qualitative approach impairment test as of January 1, 2022, for each geographical market to test indefinite-lived intangible assets for impairment by first assessing qualitative factors to determine whether it is more-likely-than-not that the fair value of an indefinite-lived intangible asset is impaired as a basis for determining whether it is necessary to perform quantitative impairment testing. As a result of the step zero test, the Company was not required to perform a step one analysis. For the year ended March 31, 2021, the Company performed a step one quantitative impairment test to determine if the fair value of the combined licenses by the associated geographical or deal market exceeds the carrying value for each geographical or deal market. Based on the results of the impairment tests, there were no impairment charges recorded during the years ended March 31, 2023, 2022 and 2021. Exchanges of Intangible Assets At times, the Company enters into agreements to exchange or cancel spectrum licenses. Upon entering into the arrangement, if the transaction has been deemed to have commercial substance, spectrum licenses are reviewed for impairment. The licenses are exchanged or cancelled at their carrying value and adjusted for any gain or loss recognized. Upon receipt of FCC approval, the spectrum licenses acquired as part of an exchange of nonmonetary assets are recorded at their new accounting basis, for those acquired from the FCC, or fair value for those acquired from third party, (collectively, the “acquired basis”). The difference between the acquired basis of the spectrum licenses obtained, carrying value of the spectrum licenses transferred and cash paid, if any, is recognized as a gain or loss on disposal of spectrum licenses reported separately on the Company’s Consolidated Statements of Operations. The acquired basis of spectrum licenses is based on information for which there is little or no observable market data. If the transaction lacks commercial substance or the acquired basis is not measurable, the acquired spectrum licenses are recorded at the carrying value of the spectrum assets transferred, cancelled or exchanged. For the purpose of the valuation of broadband licenses received in connection with nonmonetary exchanges, the Company utilizes the 600 MHz Auction price per MHzPop, as defined in the Report and Order, which is considered the accounting basis for the new broadband licenses. See Note 5 Intangible Assets for a discussion on the Company’s spectrum exchanges during the years ended March 31, 2023 and 2022. Long-Lived Assets and Right of Use Assets Impairment The Company evaluates long-lived assets, including right of use assets, other than intangible assets with indefinite lives, for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset group may not be recoverable. Asset groups are determined at the lowest level for which identifiable cash flows are largely independent of cash flows of other groups of assets and liabilities. When the carrying amount of the asset groups are not recoverable and exceeds its fair value, an impairment loss is recognized equal to the excess of the asset group’s carrying value over the estimated fair value. There were no impairment charges during the years ended March 31, 2023 and March 31, 2022. During the year ended March 31, 2021, the Company recorded an $85,000 non-cash impairment charge for long-lived assets consisting of network site and equipment costs to reduce the carrying values to zero. Fair Value Measurement A Level 1, Level 2 or Level 3 fair value hierarchy is used to categorize fair value amounts depending on the quality of inputs used to measure the fair value. Level 1 fair value derived inputs utilize quoted prices in active markets for identical assets or liabilities. Level 2 fair value derived inputs are based on quoted prices for similar assets and liabilities in active markets or based on inputs other than quoted prices for the assets or liability that are either directly or indirectly observable. Level 3 fair value derived inputs are unobservable for the asset or liability as a result of little, if any, market activity for the asset or liability. The Company uses appropriate valuation techniques for the fair values of the applicable assets or liabilities based on the available inputs. When available, the Company measures fair value using Level 1 inputs as they generally provide the most reliable evidence of fair value. The inputs may fall into different levels within the hierarchy in some valuations. In these cases, the fair value hierarchy of the asset or liability level is based on the lowest level of input that is significant to the fair value measurements. Financial Instruments Financial instruments, including cash and cash equivalents, accounts receivable, accounts payable and accrued expenses are carried at cost, which management believes approximates fair value because of the short-term maturity of these instruments. Leases Leases in which the Company is the lessee are comprised of corporate office space and tower space. Substantially all of the leases are classified as operating leases. The Company is obligated under certain lease agreements for office space with lease terms expiring on various dates from October 31, 2023 through June 30, 2027, which includes lease extensions ranging from three In accordance with Financial Accounting Standards Board, (“FASB”) Accounting Standards Codification, Leases (“ASC 842”), the Company recognized right of use (“ROU”) assets and corresponding lease liabilities on the Company’s Consolidated Balance Sheets for its operating lease agreements with contractual terms greater than 12 months. Lease liabilities are based on the present value of remaining lease payments over the lease term. As the discount rate implied in the Company’s leases is not readily determinable, the present value is calculated using the Company’s incremental borrowing rate, which is estimated to approximate the interest rate on a collateralized basis with similar terms. Revenue Recognition Revenues are recognized when a contract with a customer exists and control of the promised goods or services is transferred to the Company’s customers, in an amount that reflects the consideration it expects to be entitled to in exchange for those goods or services and the identified performance obligation has been satisfied. A performance obligation is a promise in a contract to transfer a distinct good or service to the customer and is the unit of account in Accounting Standards Codification, Revenue from Contracts with Customers (“ASC 606”). A contract’s transaction price is allocated to each distinct performance obligation and is recognized as revenue when, or as, the performance obligation is satisfied, which typically occurs when the services are rendered. Determining whether products and services are considered distinct performance obligations that should be accounted for separately versus together may require significant judgment. The Company’s contracts with customers may include multiple performance obligations. For such arrangements, the Company allocates revenue to each performance obligation based on its relative standalone selling price. It generally determines standalone selling prices based on the prices charged to customers under contracts involving only the relevant performance obligation. Judgment may be used to determine the standalone selling prices for items that are not sold separately, including services provided at no additional charge. For the Company’s customer agreements, most of the performance obligations involve delivering leased spectrum on a county-by-county basis and are generally satisfied over time as services are provided. The nature of the licenses provide the benefit of the leased spectrum regardless of whether the customer uses the spectrum or not. As a result, revenue will be recognized ratably as the Company delivers cleared 900 MHz Broadband Spectrum and the associated broadband licenses to the customer on a county-by-county basis over the contractual term. See Note 3 Revenue for a discussion of the Company’s recognized revenues during the years ended March 31, 2023, 2022 and 2021. The Company recognizes an asset for the incremental costs of obtaining a contract with a customer if it expects the benefit of those costs to be longer than one year. The Company determined that certain sales commissions met the requirements to be capitalized and were recorded as an asset upon the Company’s adoption of ASC 606. For the years ended March 31, 2023 and 2022, the Company capitalized commission costs required to obtain long-term 900 MHz Broadband Spectrum lease agreements which will be amortized over the contractual term. See Note 3 Revenue for a discussion on the Company’s capitalized contract assets incurred during the period ended March 31, 2023 and 2022. Direct Cost of Revenue The Company’s historical direct cost of revenue related to its TeamConnect service offering includes the costs of operating its dispatch network and its cloud-based solutions. With respect to sales of its historical software applications through its wireless carrier partners, direct cost of revenue includes the portion of service revenue retained by its domestic Tier 1 carrier or reseller partners pursuant to its agreements with these parties, which may include network services, connectivity, SMS service, sales, marketing, billing and other ancillary services. Contract Assets and liabilities The Company recognizes a contract asset for the incremental costs of obtaining a contract with a customer. These costs include sales commissions, equity compensation and other costs associated with acquiring customer contracts. These costs are amortized ratably using the portfolio approach over the estimated customer contract period. The Company will review the contract asset on a periodic basis to determine if an impairment exists and will review the contract assets for potential credit loss exposure. If it is determined that there is an impairment, or a potential credit loss, the Company will expense the contract asset. Contract liabilities primarily relate to advance consideration received from customers for spectrum services, for which revenue is recognized over time, as the services are performed. These contract liabilities are recorded as deferred revenue on the balance sheet. Product Development Costs The Company charges all product and development costs to expense as incurred. Types of expense incurred in product and development costs include employee compensation, consulting, travel, equipment and technology costs. Advertising and Promotional Expense The Company expenses advertising and promotional costs as incurred. Advertising and promotional expense was approximately $92,000, $89,000 and $19,000 for the years ended March 31, 2023, 2022 and 2021, respectively. Stock Compensation The Company accounts for stock options in accordance with U.S. GAAP, which requires the measurement and recognition of compensation expense, based on the estimated fair value of awards granted to consultants, employees and directors. The Company estimates the fair value of share-based awards on the date of grant using an option-pricing model. The value of the portion of the award that is ultimately expected to vest is recognized as expense in the Company’s statements of operations over the requisite service periods. In the event the participant’s employment by or engagement with (as a director or otherwise) the Company terminates before exercise of the options granted, the stock options granted to the participant shall immediately expire and all rights to purchase shares thereunder shall immediately cease and expire and be of no further force or effect, other than applicable exercise rights for vested shares that may extend past the termination date as provided for in the participant’s applicable option award agreement. Additionally, the Company’s Compensation Committee (the “Compensation Committee”) adopted an Executive Severance Plan (the “Severance Plan”) in February 2015, which was amended in February 2019, and the Company subsequently entered into Severance Plan Participation Agreements with its executive officers. In addition to providing participants with severance payments, the Severance Plan provides for accelerated vesting and extends the exercise period for outstanding equity awards if the Company terminates a participant’s service for reasons other than cause, death or disability or the participant terminates his or her service for good reason, whether before or after a change of control (each of such terms as defined in the Severance Plan). In addition to the Severance Plan, the equity awards issued to the Company’s President and Chief Executive Officer provide for accelerated vesting upon termination of service for reasons other than cause or a resignation for good reason; involuntary termination in connection with a change in control; or a change in control with a purchase price at or above $100 per share (each of such terms defined in the equity award agreements). To calculate option-based compensation, the Company uses the Black-Scholes option-pricing model. The Company’s determination of fair value of option-based awards on the date of grant using the Black-Scholes model is affected by assumptions regarding a number of subjective variables. The compensation cost for the stock options with a graded vesting schedule is recognized on an accelerated method over the vesting period. The fair value of restricted stock, restricted stock units and performance units without market conditions are measured based upon the quoted closing market price for the stock on the date of grant. The compensation cost for the restricted stock and restricted stock units is recognized on a straight-line basis over the vesting period. The compensation cost for the performance units without market conditions is recognized when the performance criteria are expected to be complete. The Company uses a Monte Carlo simulation model to determine the fair value of performance units with market condition at grant date. The Monte Carlo simulation model is based on a discounted cash flow approach, with the simulation of a large number of possible stock price outcomes for the Company’s stock and the target composite index. The use of the Monte Carlo simulation model requires the input of a number of assumptions including expected volatility of the Company’s stock price, which is based on the weighted-average historical volatility of its stock; correlation between changes in the Company’s stock price and changes in the target composite index, which is based on the historical relationship between the Company’s stock price and the target composite index average; risk-free interest rate, which is based on the treasury zero-coupon yield appropriate for the term of the performance unit as of the grant date; and expected dividends as applicable, which is zero, as the Company has never paid any cash dividends. Any future determination to pay dividends will be at the discretion of the board of directors (the “Board”) and will depend on the Company’s financial condition, results of operations, capital requirements, restrictions contained in any financing instruments and such other factors as the Board deems relevant in its sole discretion. Therefore, the Company has used an expected dividend yield of zero in the Monte Carlo simulation model. No tax benefits have been attributed to the share-based compensation expense because the Company maintains a full valuation allowance for all net deferred tax assets. All excess tax benefits and tax deficiencies, including tax benefits of dividends on share-based payment awards, are recognized as income tax expense or benefit in the income statement, eliminating the notion of the additional paid-in capital (“APIC”) pool. The excess tax benefits are classified as operating activities along with other income tax cash flows rather than financing activities in the statement of cash flows. The tax effects of exercised or vested awards are treated as discrete items in the reporting period in which they occur. Cash payments to tax authorities in connection with shares withheld to meet statutory tax withholding requirements are presented as a financing activity in the statement of cash flows. Retirement of common stock From time to time, the Company may acquire its common stock through share repurchases or option exercise swaps and return these shares to authorized and unissued. If the Company elects to retire these shares, the Company’s policy is to allocate a portion of the repurchase price to par value of common stock with the excess over par value allocated to accumulated deficit. Income Taxes The Company utilizes the asset and liability method of accounting for income taxes. Under this method, deferred tax assets and liabilities are recognized for the expected future tax consequences of temporary differences between the carrying amounts and the tax bases of assets and liabilities as well as from net operating loss and tax credit carryforwards. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in operations in the period that includes the enactment date. A valuation allowance is established when it is estimated that it is more likely than not that the tax benefit of a deferred tax asset will not be realized. Changes in valuation allowance for the years ended March 31, 2023, 2022 and 2021 are summarized below (in thousands): 2023 2022 2021 Balance at beginning of the year $ 79,998 $ 65,304 $ 47,664 Charged to costs and expenses 1,218 979 124 Changes in net loss carryforward and other 4,768 13,715 17,516 Balance at end of the year $ 85,984 $ 79,998 $ 65,304 Accounting for Uncertainty in Income Taxes The Company recognizes the effect of tax positions only when they are more likely than not to be sustained. Management has determined that the Company had no uncertain tax positions that would require financial statement recognition or disclosure. The Company is no longer subject to U.S. federal, state or local income tax examinations for periods prior to 2019. When applicable, the Company recognizes interest and penalties related to unrecognized tax benefits as a component of income tax expense. Net Loss Per Share of Common Stock Basic net loss per common share is calculated by dividing the net loss attributable to common stockholders by the weighted-average number of common shares outstanding during the period, without consideration for potentially dilutive securities. For purposes of the diluted net loss per share calculation, preferred stock, convertible notes payable-affiliated entities, stock options, restricted stock and warrants are considered to be potentially dilutive securities. Because the Company has reported a net loss for the years ended March 31, 2023, 2022 and 2021, diluted net loss per common share is the same as basic net loss per common share for those periods. Common stock equivalents resulting from potentially dilutive securities approximated 352,000, 1,343,000 and 1,382,000 at March 31, 2023, 2022 and 2021, respectively, and have not been included in the dilutive weighted average shares of common stock outstanding, as their effects are anti-dilutive. Recently Issued Accounting Pronouncements While there have been accounting standards that have been issued or proposed by the FASB or other standard-setting bodies that do not require adoption until a future date, these updates are not expected to have a material impact on the Company’s consolidated financial statements upon adoption .

Revenue

Revenue	12 Months Ended
	Mar. 31, 2023
Revenue from Contract with Customer [Abstract]
Revenue	Revenue The following table provides information regarding the Company’s revenue for each of the services it provides pursuant to its spectrum revenue agreements for the years ended March 31, 2023, 2022 and 2021 (in thousands): 2023 2022 2021 Spectrum revenues 900 MHz Broadband Spectrum Revenue Ameren $ 609 $ 355 $ — Evergy (1) 581 — — Narrowband Spectrum Revenue Motorola 729 729 729 Total spectrum revenue (2) $ 1,919 $ 1,084 $ 729 Services revenue — — 192 Total operating revenues $ 1,919 $ 1,084 $ 921 1. The Company commenced revenue recognition in connection with the delivery of cleared 900 MHz Broadband Spectrum and the associated broadband licenses to Evergy for 81 counties. 2. Revenue recognized during the years ended March 31, 2023, 2022 and 2021 was included in deferred revenue at the beginning of the respective periods. 900 MHz Broadband Spectrum Revenue In December 2020, the Company entered into its first long-term lease agreements of 900 MHz Broadband Spectrum with Ameren. The Ameren Agreements will enable Ameren to deploy a PLTE network in its service territories in Missouri and Illinois, covering approximately 7.5 million people. Each Ameren Agreement is for an initial term of 30 years with a 10-year renewal option for an additional payment. The scheduled prepayments for the 30-year initial terms of the Ameren Agreements total $47.7 million, of which $0.3 million was received by the Company in February 2021, $5.4 million in September 2021 and $17.2 million in October 2021. The prepayments received to date encompass the initial upfront payment(s) due upon signing of the Ameren Agreements and payments for delivery of the relevant 1.4 x 1.4 cleared spectrum in several metropolitan counties throughout Missouri and Illinois, in accordance with the terms of the Ameren Agreements. The remaining prepayments for the 30-year initial term are due by mid-2026, per the terms of the Ameren Agreements and as the Company delivers the relevant cleared 900 MHz Broadband Spectrum and the associated broadband licenses. The Company is working with incumbents to clear the 900 MHz Broadband Spectrum allocation in Ameren’s service territory. In August 2021, the FCC granted the first 900 MHz broadband licenses to the Company for several counties in Ameren’s service territory, for which the Ameren Agreements were also subsequently approved by the FCC. In accordance with ASC 606, the payments of prepaid fees under the Ameren Agreements will be accounted for as deferred revenue on the Company’s Consolidated Balance Sheets. Revenue is recognized over time as the performance obligations of clearing the 900 MHz Broadband Spectrum and the associated broadband licenses are delivered by respective county, over the contractual term of 30-years. In September 2021, the Company entered into a long-term lease agreement of 900 MHz Broadband Spectrum with Evergy. The Evergy service territories covered by the Evergy Agreement are in Kansas and Missouri, with a population of approximately 3.9 million people. The Evergy Agreement is for an initial term of 20 years with two 10-year renewal options for additional payments. Prepayment in full of the $30.2 million for the 20-year initial term, which was due and payable within thirty (30) days after execution of the Evergy Agreement, was received by the Company in October 2021. The Company is working with incumbents to clear the 900 MHz Broadband Spectrum allocation covered by the Evergy Agreement. In accordance with ASC 606, the payments of prepaid fees under the Evergy Agreement will be accounted for as deferred revenue on the Company’s Consolidated Balance Sheets. Revenue is recognized over time as the performance obligations of clearing the 900 MHz Broadband Spectrum and the associated broadband licenses are delivered by respective county, over the contractual term of 20-years. In October 2022, the Company entered into an agreement with Xcel Energy providing Xcel Energy dedicated long-term usage of the Company’s 900 MHz Broadband Spectrum for a term of 20 years throughout Xcel Energy’s service territory in eight states including Colorado, Michigan, Minnesota, New Mexico, North Dakota, South Dakota, Texas and Wisconsin. The Xcel Energy Agreement also provides Xcel Energy an option to extend the agreement for two 10-year terms for additional payments. The Xcel Energy Agreement allows Xcel Energy to deploy a PLTE network to support its grid modernization initiatives for the benefit of its approximately 3.7 million electricity customers and 2.1 million natural gas customers. The scheduled prepayments for the 20-year initial term of the Xcel Energy Agreement total $80.0 million, of which $8.0 million was received by the Company in December 2022. The remaining prepayments for the 20-year initial term are due by mid-2028, per the terms of the Xcel Energy Agreement and as the Company delivers the relevant cleared 900 MHz Broadband Spectrum and the associated broadband licenses. The Company is working with incumbents to clear the 900 MHz Broadband Spectrum allocation in Xcel Energy service territories. In accordance with ASC 606, the payments of prepaid fees under the Xcel Energy Agreement will be accounted for as deferred revenue on the Company’s Consolidated Balance Sheets. Revenue will be recognized over time as the performance obligations of clearing the 900 MHz Broadband Spectrum and the associated broadband licenses are delivered by respective county, over the contractual term of approximately 20-years. Narrowband Spectrum Revenue In September 2014, Motorola paid the Company an upfront, fully-paid fee of $7.5 million in order to use a portion of the Company’s narrowband spectrum licenses. The payment of the fee is accounted for as deferred revenue on the Company’s Consolidated Balance Sheets and is recognized ratably as the service is provided over the contractual term of approximately ten years. Service Revenue The Company has historically derived its service revenue from its pdvConnect, TeamConnect, and Diga-talk service offerings. In December 2018, the Board approved the transfer of various customers under its TeamConnect business to A BEEP and Goosetown along with the support for its pdvConnect business to help reduce operating costs and to allow the Company to focus on its FCC initiatives and future broadband opportunities. As a result of the completion of the migration to A BEEP and Goosetown in December 2020, service revenue is recorded to other income on the Company’s Consolidated Statements of Operations. The payments received from Goosetown ended during Fiscal 2022 and A BEEP is expected to continue to provide payments until December 2024. Contract Assets The following table presents the activity for the Company’s contract assets (in thousands): 2023 2022 Balance at the beginning of the year $ 638 $ 381 Additions 249 263 Amortization (17) (6) Impairment — — Balance at the end of the year 870 638 Less amount classified as current assets - prepaid expenses and other current assets (418) (238) Noncurrent assets - included in other assets $ 452 $ 400 Contract liabilities The following table presents the activity for the Company’s contract liabilities (in thousands): 2023 2022 Balance at the beginning of the year $ 54,678 $ 2,983 Additions 8,000 52,779 Revenue recognized (1,919) (1,084) Balance at the end of the year 60,759 54,678 Less amount classified as current liabilities (2,769) (1,478) Noncurrent liabilities $ 57,990 $ 53,200

Property and Equipment

Property and Equipment	12 Months Ended
	Mar. 31, 2023
Property, Plant and Equipment [Abstract]
Property and Equipment	Property and Equipment Property and equipment consists of the following at March 31, 2023 and 2022 (in thousands): Estimated 2023 2022 Network sites and equipment 5-10 years $ 12,292 $ 14,588 Computer software 1-7 years 847 639 Computer equipment 5-7 years 279 204 Furniture and fixture and other equipment 2-5 years 450 415 Leasehold improvements Shorter of the lease term or 10 years 819 242 14,687 16,088 Less accumulated depreciation 11,628 13,379 3,059 2,709 Construction in process 547 240 Property and equipment, net $ 3,606 $ 2,949 Depreciation expense for the years ended March 31, 2023, 2022 and 2021 amounted to approximately $1.4 million, $1.5 million and $3.5 million, respectively. During the year ended March 31, 2021, the Company recorded $85,000 of non-cash impairment charges for network sites and equipment to reduce the carrying values to zero. There were no impairment charges during the years ended March 31, 2023 and March 31, 2022.

Intangible Assets

Intangible Assets	12 Months Ended
	Mar. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets	Intangible Assets Wireless licenses are considered indefinite-lived intangible assets. Indefinite-lived intangible assets are not subject to amortization but instead are tested for impairment annually, or more frequently if an event indicates that the asset might be impaired. There were no impairment charges related to the Company’s indefinite-lived intangible assets during the years ended March 31, 2023, 2022 and 2021. Intangible assets consist of the following at March 31, 2023 and 2022 (in thousands): Wireless Licenses Balance at March 31, 2021 $ 122,117 Acquisitions 17,843 Exchanges - licenses received 15,341 Exchanges - licenses surrendered (4,132) Balance at March 31, 2022 151,169 Acquisitions 12,476 Exchanges - licenses received 46,174 Exchanges - licenses surrendered (7,775) Balance at March 31, 2023 $ 202,044 Purchases of intangible assets, including refundable deposits During the years ended March 31, 2023, 2022 and 2021, the Company entered into agreements with several third parties in multiple U.S. markets to acquire, retune or swap wireless licenses for cash consideration (“deals”) and made Anti-Windfall Payments to the U.S. Treasury Department. The initial deposits to incumbents are recorded as prepaid expenses and other current assets on the Company’s Consolidated Statements of Balance Sheets and are refundable if the FCC does not approve the sale, retuning or swap of the spectrum. The initial deposits are transferred to other assets or intangible assets in the Company’s Consolidated Statements of Balance Sheets, as applicable, upon meeting the relevant deal milestones. The final payments related to closed retuning or swap deals are recorded as other assets on the Company’s Consolidated Statements of Balance Sheets. The final payments for license purchases or Anti-Windfall Payments are recorded as intangible assets on the Company’s Consolidated Statements of Balance Sheets. The purchases of intangible assets, including refundable deposits, consisted of the following activity during the years March 31, 2023, 2022 and 2021 (in thousands): 2023 2022 2021 Refundable deposits * $ 6,492 $ 5,621 $ (1,986) Retuning cost and Swaps 6,036 2,894 290 Purchases and Anti-Windfall Payments 12,476 17,843 15,640 Total $ 25,004 $ 26,358 $ 13,944 * The decrease in refundable deposits during the year end 2021 was related to the exchange of narrowband license discussed below. Broadband License Exchanges During the year ended March 31, 2023, the Company was granted by the FCC, broadband licenses for 84 counties. The Company recorded the new broadband licenses at their estimated accounting cost basis of approximately $46.2 million. In connection with receiving the broadband licenses, the Company disposed of $7.8 million related to the value ascribed to the narrowband licenses it relinquished to the FCC for the same 84 counties. The total carrying value of narrowband licenses included the cost to acquire the original narrowband licenses, Anti-Windfall Payments paid to cover the shortfall in each county and the clearing costs. As a result of the exchange of narrowband licenses for broadband licenses, the Company recorded a gain on disposal of intangible assets of $38.4 million, for the year ended March 31, 2023. During the year ended March 31, 2022, the Company was granted by the FCC, broadband licenses for 21 counties. The Company recorded the new broadband licenses at their estimated accounting cost basis of approximately $15.3 million. In connection with receiving the broadband licenses, the Company disposed of $4.1 million related to the value ascribed to the narrowband licenses it relinquished to the FCC for the same 21 counties. The total carrying value of narrowband licenses included the cost to acquire the original narrowband licenses, Anti-Windfall Payments paid to cover the shortfall in each county and the clearing costs. As a result of the exchange of narrowband licenses for broadband licenses, the Company recorded a gain on disposal of intangible assets of $11.2 million, for the year ended March 31, 2022. Narrowband License Exchanges In September 2020, the Company closed an agreement with a third party for the exchange of 900 MHz licenses. Under the agreement, the Company received spectrum licenses at their estimated fair value of approximately $0.2 million and a payment of $1.2 million in cash to clear the channels received from incumbents. In January 2018, the Company received $0.6 million as a refundable deposit when the agreement was executed during the year ended March 31, 2018, and the Company is entitled to receive the remaining $0.6 million upon receipt of FCC approval and closing of the agreement in September 2020. Under the agreement, the Company transferred spectrum licenses with book value of approximately $0.3 million to the third party. The Company recognized a $1.1 million gain from disposal of intangible assets on the Company’s Consolidated Statements of Operations when the deal closed in September 2020. The Association of American Railroads The nation’s railroads, particularly the major freight lines, operate on six narrowband 900 MHz channels licensed to the Association of American Railroads (“AAR”). Three of these narrowband channels are located in the 900 MHz broadband segment created by the FCC in the Report and Order. As a result, in order to qualify for broadband licenses under the Report and Order, the Company will be required to provide spectrum for the relocation of the AAR channels to narrowband channels outside the 900 MHz broadband segment. In January 2020, the Company entered into an agreement with the AAR pursuant to which the Company agreed to cancel licenses in the 900 MHz band to enable the AAR to relocate its operations, including operations utilizing the three channels located in the 900 MHz broadband segment (the “AAR Agreement”). The Report and Order provides that the FCC will make the channels associated with these licenses available to the AAR to enable the AAR to relocate their current operations. The Report and Order also provides that the FCC will credit the Company for its cancelled licenses for purposes of determining the Company’s eligibility to secure broadband licenses and the calculation of any Anti-Windfall Payments. In accordance with the Report and Order and the AAR Agreement, the Company cancelled its licenses in June 2020. Because the Company did not receive any licenses nor monetary reimbursement in exchange for the cancellation, but only credit for purposes of determining its future eligibility and payment obligations for broadband licenses under the Report and Order, the Company recorded a $4.7 million loss from disposal of the intangible assets on the Company’s Consolidated Statements of Operations for the year ended March 31, 2021.

Accounts Payable and Accrued Ex

Accounts Payable and Accrued Expenses	12 Months Ended
	Mar. 31, 2023
Payables and Accruals [Abstract]
Accounts Payable and Accrued Expenses	Accounts Payable and Accrued Expenses The table below provides additional information related to the Company’s accounts payable and accrued expenses at March 31, 2023 and 2022 (in thousands): 2023 2022 Accounts payable $ 755 $ 1,044 Accrued employee related expenses 4,271 4,730 Accrued expenses 1,267 735 Other 331 17 Total accounts payable and accrued expenses $ 6,624 $ 6,526

Related Party Transactions

Related Party Transactions	12 Months Ended
	Mar. 31, 2023
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions In connection with the transfer of its TeamConnect business and support for its pdvConnect business, the Company entered into a memorandum of understanding (“MOU”) with the principals of Goosetown on December 31, 2018. Under the MOU, the Company agreed to assign the intellectual property rights to its pdvConnect application to TeamConnect LLC (“LLC”), a new entity formed by the principals of Goosetown, in exchange for a 19.5% ownership interest in the LLC, effective April 30, 2019. Under the terms of the MOU, the Company was obligated to pay the LLC a monthly service fee for a 24-month period ending on January 7, 2021 for its assumption of the Company’s support obligations under the A BEEP and Goosetown Agreements. The Company is also obligated to pay the LLC a certain portion of the billed revenue received by the Company from pdvConnect customers for a 48-month period. On February 22, 2023, the Company amended the LLC agreement to withdraw as a member of the LLC for no consideration. For the years ended March 31, 2023, 2022 and 2021, the Company incurred payments of $55,000, $60,000 and $0.6 million under the MOU, respectively. As of March 31, 2023 and March 31, 2022, the Company did not have outstanding liabilities to the related parties associated with the services transfer. During the year ended March 31, 2023, the Company purchased equipment from Motorola in the amount of $1.4 million. In addition, the Company entered into a Frequency Relocation Agreement with Motorola for a total amount of $1.0 million, of which the Company paid $0.1 million during the year ended March 31, 2023. The Company did not purchase any equipment from Motorola for the years ended March 31, 2022 and 2021. The Company recognized approximately $0.7 million each year in Spectrum revenue for the years ended March 31, 2023, 2022 and 2021. As of March 31, 2023, the Company owed $0.5 million to Motorola in connection with the equipment purchased. As of March 31, 2022, the Company owed $0.1 million to Motorola, unrelated to the Frequency Relocation Agreement. On May 5, 2020, the Company entered into a consulting agreement with Rachelle B. Chong under which Ms. Chong will serve as a Senior Advisor to the Company’s management team effective May 15, 2020. In connection with the consulting agreement, Ms. Chong submitted her resignation from the Board and as a member of the Board’s Nominating and Corporate Governance Committee. For the years ended March 31, 2023, 2022 and 2021, the Company incurred $0.1 million and $0.1 million and $0.1 million, respectively, in consulting fees to Ms. Chong. As of March 31, 2023 and 2022, the Company did not have any outstanding liabilities to Ms. Chong. On June 25, 2020, as part of its Executive Succession Plan (the “Succession Plan”), the Company announced that Brian D. McAuley had submitted his resignation as Executive Chairman of the Board, effective on July 1, 2020. On August 27, 2020, the Company entered into a consulting agreement (the “Consulting Agreement”) with Mr. McAuley under which Mr. McAuley will serve as a Senior Advisor to the Company’s management team and provide strategic, corporate governance and Board advisory services. In July 2022, the Company extended the agreement by an additional 12 months with a new termination date of September 1, 2023. The Consulting Agreement provides that Mr. McAuley will receive cash compensation of $40,000 per year and allow for his outstanding equity awards to continue to vest, unless accelerated pursuant to the terms of the agreement. For the years ended March 31, 2023, 2022 and 2021, the Company incurred approximately $40,000, $40,000 and $23,000, respectively, in consulting fees to Mr. McAuley. As of March 31, 2023 and 2022, the Company did not have any outstanding liabilities to Mr. McAuley.

Leases

Leases	12 Months Ended
	Mar. 31, 2023
Leases [Abstract]
Leases	Leases A lease is defined as a contract that conveys the right to control the use of identified property, plant or equipment for a period of time in exchange for consideration. On April 1, 2019, the Company adopted ASC 842 and it primarily affected the accounting treatment for operating lease agreements in which the Company is the lessee. Substantially all the leases in which the Company is the lessee are comprised of corporate office space and tower space. The Company is obligated under certain lease agreements for office space with lease terms expiring on various dates from October 31, 2023 through June 30, 2027, which includes lease extensions for its corporate headquarters ranging from three Substantially all of the Company’s leases are classified as operating leases, and as such, were previously not recognized on the Company’s Consolidated Balance Sheet. With the adoption of ASC 842, operating lease agreements are required to be recognized on the Company’s Consolidated Balance Sheet as ROU assets and corresponding lease liabilities. ROU assets include any prepaid lease payments and exclude any lease incentives and initial direct costs incurred. Lease expense for minimum lease payments is recognized on a straight-line basis over the lease term. The lease terms may include options to extend or terminate the lease if it is reasonably certain that the Company will exercise that option. Weighted-average remaining lease term and discount rate for the Company’s operating leases are as follows: 2023 2022 Weighted average term - operating lease liabilities 2.87 years 3.57 years Weighted average incremental borrowing rate - operating lease liabilities 12 % 13 % Rent expense amounted to approximately $1.8 million for the year ended March 31, 2023, of which is included in general and administrative expenses on the Company’s Consolidated Statement of Operations. Rent expense amounted to approximately $2.0 million for the year ended March 31, 2022, of which is included in general and administrative expenses on the Company’s Consolidated Statement of Operations. Rent expense amounted to approximately $2.6 million for the year ended March 31, 2021, of which approximately $1.2 million are included in direct cost of revenue and the remainder of approximately $1.4 million included in general and administrative on the Company’s Consolidated Statement of Operations. For the years ended March 31, 2023, 2022 and 2021, the following table presents net lease cost (in thousands): 2023 2022 2021 Lease cost Operating lease cost (cost resulting from lease payments) $ 1,817 $ 1,950 $ 2,451 Short term lease cost 7 16 110 Sublease income — — (6) Net lease cost $ 1,824 $ 1,966 $ 2,555 For the years ended March 31, 2023, 2022 and 2021, the following table presents other supplemental cash flow lease information (in thousands): 2023 2022 2021 Cash paid activity: Operating lease - operating cash flows (fixed payments) $ 2,217 $ 2,286 $ 2,746 Operating lease - operating cash flows (liability reduction) $ 1,042 $ 1,382 $ 1,674 Non-cash activity: Right of use assets obtained in exchange for new operating lease liabilities $ 165 $ 116 $ 230 The following table presents supplemental balance sheet information as of March 31, 2023 and 2022 (in thousands): 2023 2022 Non-current assets - right of use assets, net $ 3,371 $ 4,047 Current liabilities - operating lease liabilities $ 1,725 $ 1,512 Non-current liabilities - operating lease liabilities $ 2,922 $ 4,177 Future minimum payments under non-cancelable leases for office and tower spaces (exclusive of real estate tax, utilities, maintenance and other costs borne by the Company) for the remaining terms of the leases following the year ended March 31, 2023 are as follows (in thousands): Fiscal Year Operating 2024 $ 2,161 2025 1,701 2026 943 2027 521 2028 156 After 2027 20 Total future minimum lease payments 5,502 Amount representing interest (855) Present value of net future minimum lease payments $ 4,647

Income Taxes

Income Taxes	12 Months Ended
	Mar. 31, 2023
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes For the year ended March 31, 2023, the Company had federal and state NOL carryforwards of approximately $327.8 million and $216.7 million respectively. Of these federal and state NOLs, approximately $90.3 million and $153.0 million, respectively, are expiring in various amounts from 2023 through 2037. The remaining federal and state NOLs of approximately $237.5 million and $63.7 million, respectively, have an indefinite life but the federal NOLs may only offset 80% of taxable income when used. For the year ended March 31, 2022, the Company incurred federal and state operating losses of approximately $330.7 million and $191.8 million, respectively, to offset future taxable income, of which $240.4 million federal NOL and $37.3 million of state NOLs can be carried forward indefinitely but can only offset 80% of taxable income when used. The Company has net deferred tax assets, before applying the valuation allowance, of approximately $80.5 million and $75.8 million relating principally to the NOLs as of March 31, 2023 and 2022, respectively. Federal NOL carryforwards may be subject to limitations as a result of the change in ownership that occurred in the year ended March 31, 2015, as defined under Internal Revenue Code Section 382. State NOL carryforwards are subject to limitations which differ from federal law in that they may not allow the carryback of net operating losses and have shorter carryforward periods. Accounting Standards Codification Topic 740, Income Taxes, requires that a valuation allowance be recorded to reduce deferred tax assets when it is more likely than not that the tax benefit of the deferred tax assets will not be realized. The evaluation includes the consideration of all available evidence, both positive and negative, regarding historical operating results including recent years with reported losses, the estimated timing of future reversals of existing taxable temporary differences, estimated future taxable income exclusive of reversing temporary differences and carryforwards, and potential tax planning strategies which may be employed to prevent an operating loss or tax credit carryforward from expiring unused. In situations where a three-year cumulative loss condition exists, accounting standards limit the ability to consider projections of future results as positive evidence to assess the realizability of deferred tax assets. Since inception, the Company has incurred consecutive tax losses which represents significant negative evidence toward the realizability of its deferred tax assets. Therefore, the Company continues to apply a full valuation allowance against its deferred tax assets as of March 31, 2023 and 2022, with the exception of the net deferred tax liability of approximately $5.4 million and $4.2 million, respectively, regarding indefinite-lived intangibles. For Fiscal 2023, analysis of the state NOL carryforwards revealed that most of them are not indefinite. The Company recorded $0.8 million of state deferred tax expense during the year March 31, 2023 and increased the state deferred tax liability by the same amount from the inability to use the state NOL carryforwards against the indefinite-lived intangible. For Fiscal 2022, the Company recorded $0.6 million of state deferred tax benefit during the year March 31, 2022 and decreased the state deferred tax liability by the same amount from the inability to use the state NOL carryforwards against the indefinite-lived intangible. This valuation allowance has no effect on the Company’s ability to utilize the deferred tax assets to offset future taxable income, if generated. As required by U.S. GAAP, the Company will continue to assess the likelihood that the deferred tax assets will be realizable in the future and the valuation allowance will be adjusted accordingly. The tax benefits relating to any reversal of the valuation allowance on the net deferred tax assets in a future period will be recognized as a reduction of future income tax expense in that period. Net deferred tax assets and liabilities consist of the following as of March 31, 2023 and 2022 (in thousands): 2023 2022 Deferred tax asset Property and equipment $ 724 $ 700 Accrued expenses 209 998 Deferred revenue 6,131 502 Asset retirement obligations 13 12 Net operating loss carryforward 81,908 81,818 Operating lease liabilities 1,312 1,434 Charitable contributions carryforward 64 60 Stock compensation expense 6,744 4,408 Total deferred tax asset 97,105 89,932 Deferred tax liability Right of use assets (821) (1,006) Indefinite-lived intangible assets (15,740) (13,120) Total deferred tax liability (16,561) (14,126) Total deferred tax assets and liabilities 80,544 75,806 Valuation allowance (85,984) (79,998) Net deferred tax assets and liabilities $ (5,440) $ (4,192) The components of the income tax expense for the years ended March 31, 2023, 2022 and 2021 are as follows (in thousands): 2023 2022 2021 Current: Federal $ — $ — $ — State 44 5 2 Total current* 44 5 2 Deferred: Federal 442 370 251 State 776 608 (127) Total deferred 1,218 978 124 Total income tax expense $ 1,262 $ 983 $ 126 * Fiscal 2021 current state tax expense was recorded as general and administrative expense. The differences between the United States federal statutory tax rate and the Company’s effective tax rate for the years ended March 31, 2023, 2022 and 2021 are as follows (in thousands): 2023 2022 2021 Statutory federal tax $ (3,162) 21 % $ (7,672) 21 % $ (11,405) 21 % State income taxes, net of federal benefit 814 -23 % 612 -2 % (125) 1 % Incentive stock option expense (27) 0 % (564) 2 % (720) 1 % Other permanent differences (62) 0 % (4,017) 11 % (251) 0 % 162M executive compensation limit 316 -2 % 1,673 -5 % 729 -1 % Restricted stock shortfall/windfall — 0 % (617) 2 % (136) 0 % Change in valuation allowance - Federal 3,314 -22 % 11,408 -31 % 14,570 -27 % Prior-year adjustments 69 0 % 160 -1 % (2,536) 5 % $ 1,262 -26 % $ 983 -3 % $ 126 0 %

Stock Acquisition Rights, Stock

Stock Acquisition Rights, Stock Options and Warrants	12 Months Ended
	Mar. 31, 2023
Share-Based Payment Arrangement [Abstract]
Stock Acquisition Rights, Stock Options and Warrants	Stock Acquisition Rights, Stock Options and Warrants The Company established the 2014 Stock Plan (the “2014 Stock Plan”) to attract, retain and reward individuals who contribute to the achievement of the Company’s goals and objectives. This 2014 Stock Plan superseded previous stock plans. The Board has reserved 5,027,201 shares of common stock for issuance under the 2014 Stock Plan as of March 31, 2023, of which 502,256 shares are available for future issuance. Historically, the number of shares reserved under the 2014 Stock Plan were increased, based on Board approval, each January 1 by an amount equal to the lesser of (i) 5% of the number of shares of common stock issued and outstanding on the immediately preceding December 31 or (ii) a lesser amount determined by the Board (the “evergreen provision”). Effective January 1, 2021, the Board elected to increase the shares authorized under the 2014 Stock Plan by 879,216 shares, which represented 5% of the of the Company’s common stock issued and outstanding as of December 31, 2020. On June 14, 2021, the Compensation Committee of the Board approved Amendment No. 1 to 2014 Stock Plan to eliminate the evergreen provision for all future years (i.e., January 1, 2022 through January 1, 2024). Restricted Stock and Restricted Stock Units A summary of non-vested restricted stock activity for the year ended March 31, 2023 is as follows: Restricted Weighted Non-vested restricted stock outstanding at March 31, 2022 544,287 $ 47.39 Granted 255,912 47.85 Vested (214,029) 46.22 Forfeited (17,508) 50.92 Non-vested restricted stock outstanding at March 31, 2023 568,662 $ 47.93 The following table reflects activity related to our restricted stock for the years ended March 31, 2023, 2022 and 2021: 2023 2022 2021 Weighted-average grant-date fair value per unit granted $ 47.85 $ 50.64 $ 46.07 Fair value of restricted stock units vested (in thousands) $ 12,245 $ 12,240 $ 8,165 The Company recognizes compensation expense for restricted stock on a straight-line basis over the explicit vesting period. Vested restricted stock units are settled and issuable upon the earlier of the date the employee ceases to be an employee of the Company or a date certain in the future. Stock compensation expense related to restricted stock was approximately $10.9 million for the year ended March 31, 2023, which included $9.8 million in general and administrative expenses, $0.6 million in product development and the remainder of approximately $0.5 million included in sales and support reported on the Company’s Consolidated Statements of Operations. Stock compensation expense related to restricted stock was approximately $9.7 million for the year ended March 31, 2022, which included $8.5 million in general and administrative expenses, $0.7 million in product development and the remainder of approximately $0.5 million included in sales and support reported on the Company’s Consolidated Statements of Operations. Stock compensation expense related to restricted stock was approximately $9.2 million for the year ended March 31, 2021, which included $0.8 million of expense related to the Type III modification of restricted stock units held by the Company’s former Chairman of the Board upon his transition to a consultant to the Company that is probable of vesting under the modified condition of which approximately, $8.4 million are included in general and administrative expenses, $0.6 million in product development and the remainder of approximately $0.2 million included in sales and support reported on the Company’s Consolidated Statements of Operations. As of March 31, 2023, the Company did not incur stock compensation costs to obtain its long-term 900 MHz Broadband Spectrum lease agreements. As of March 31, 2022, the Company incurred stock compensation costs to obtain its long-term 900 MHz Broadband Spectrum lease agreements amounting to approximately $0.1 million, which was capitalized and will be amortized over the contractual term of approximately 20-years. In May 2020, the Compensation Committee granted restricted stock awards for 28,000 shares of common stock, or approximately $1.5 million, to satisfy the Fiscal 2021 bonus liability, recorded in accounts payable and accrued expenses, for key individuals. As of March 31, 2023 and 2022, there was $18.5 million and $18.4 million, respectively, of unvested compensation expense for the restricted stock, which is expected to be recognized over a weighted average period of 2.31 years and 2.53 years, respectively. Performance-Based Restricted Stock Units A summary of the performance-based restricted stock unit activity for the year ended March 31, 2023 is as follows: Performance Stock Weighted Performance stock outstanding at March 31, 2022 75,049 $ 58.65 Granted — — Vested — — Forfeited/cancelled — — Performance stock outstanding at March 31, 2023 75,049 $ 58.65 The following table reflects activity related to our performance-based restricted stock units for the years ended March 31, 2023, 2022 and 2021: 2023 2022 2021 Weighted-average grant-date fair value per unit granted $ — $ — $ 58.65 Fair value of Performance stock units vested (in thousands) $ — $ — $ 3,941 Outstanding performance stock units included in the table above are shown at target. Share payout can range from 0% to 200% for CEO Performance Units (as defined below) based on the Cumulative Spectrum Proceeds Monetized (“CSPM”) metric and 25% to 350% for CEO Performance Units based on the Total Stockholders Return (“TSR Performance Units”) metrics. Performance-Based related to Report and Order and Long-Term Agreement(s) On February 28, 2020, the Company awarded 95,538 performance-based restricted stock units. The performance goals are: (A) Target Goal : 50% of the shares vest upon (i) achievement by December 31, 2020 of a Final Order from the FCC providing for the creation and allocation of licenses for spectrum in the 900 MHz band consisting of paired blocks of contiguous spectrum, each containing at least 3 MHz of contiguous spectrum, authorized for broadband wireless communications uses and (ii) the lack of objection by the Board to the terms and conditions (including, but not limited to, the rebanding, clearing and relocation procedures, license assignment and award mechanisms and technical and operational rules) set forth or referenced in the Final Order; and (B) Stretch Goal : The remaining 50% of the performance shares vest and settle upon the occurrence of all three of the following conditions: (i) the Company enters into one or more long-term agreement(s) with critical infrastructure or enterprise business(es) to enable such business(es) to utilize the Company’s spectrum for broadband connectivity; (ii) the combined total contract dollars payable to the Company over the initial term(s) of such agreement(s) equals or exceeds a certain amount as specified by the Board; and (iii) the agreement(s) is/are binding on such business(es) and is/are either not contingent on prior Board approval(s) or such approval(s) has/have been received. Additionally, on February 28, 2020, the Company awarded 43,446 performance-based restricted stock units. The performance goal related to these units is: 100% of the shares will vest upon (i) achievement by December 31, 2020 of a Final Order providing for the creation and allocation of licenses for spectrum in the 900 MHz band consisting of paired blocks of contiguous spectrum, each containing at least 3 MHz of contiguous spectrum, authorized for broadband wireless communications uses and (ii) the lack of objection by the Board to the terms and conditions (including, but not limited to, the rebanding, clearing and relocation procedures, license assignment and award mechanisms and technical and operational rules) set forth or referenced in the Final Order. On September 30, 2020, the Company recorded stock compensation expense included in general and administrative expenses reported on the Company’s Consolidated Statements of Operations amounting to approximately $4.3 million based on the achievement of the Target Goal described above or approximately 91,216 shares under the performance-based restricted stock units, upon the Report and Order becoming effective in August 2020. As of March 31, 2021, there was no stock compensation expense recognized for the Stretch Goal described above under the performance-based restricted stock units as the 47,768 performance-based restricted stock units expired as unvested. CEO Performance Units Cumulative Spectrum Proceeds Monetized On December 31, 2020, the Compensation Committee awarded performance-based restricted units to the Company’s President and Chief Executive Officer as part of the Succession Plan, (the “CEO Performance Units”). The performance-based restricted units will vest on a determination date of June 24, 2024 (“Determination Date”) (unless sooner triggered by an earlier involuntary termination), based on Cumulative Spectrum Proceeds Monetized (“CSPM”) metric over a four-year measurement period commencing on June 24, 2020, with 15,025 units vesting if the minimum CSPM level is achieved, 30,049 units vesting if the target CSPM metric is achieved and up to 60,098 vesting if the maximum CSPM metric is achieved. The Company recorded approximately $0.3 million, $0.3 million and $0.1 million of stock compensation expense included in general and administrative expenses reported on the Company’s Consolidated Statements of Operations relating to the CEO Performance Units - CSPM for the years ended March 31, 2023, 2022 and 2021, respectively. As of March 31, 2023 and 2022, there was approximately $0.8 million and $0.8 million, respectively, of unvested compensation expense for the outstanding performance-based restricted stock units related to the December 31, 2020 CEO Performance Units, which is expected to be recognized over a weighted average period of 1.49 years and 2.49 years, respectively. Total Stockholder Return On February 1, 2021, the Compensation Committee awarded performance-based restricted units to the Company’s President and Chief Executive Officer based on Total Stockholder Return metrics (“TSR Performance Units”). The performance-based restricted units will vest upon continued service and achievement of certain stock price levels calculated using a four-year compound annual growth rate and based on the average closing bid price per share of the Company’s common stock measured over a sixty-trading day period (“Stock Price Levels”). Shares will vest in a range of 25% to 350% of the 45,000 target reported units based on achieving specified Stock Price Levels. The vesting end measurement date is February 1, 2025, with earlier vesting determination dates upon a change in control of the Company, involuntary termination of the CEO or twelve months following the achievement of the maximum stock price level. If after February 1, 2023, the President and Chief Executive Officer achieves a Stock Price Level, there will be a vesting determination date the earlier of twelve months thereafter or February 1, 2025. The following assumptions were used to calculate the grant date fair value of performance-based restricted units with market price condition using the Monte Carlo simulation model: February 1, 2021 Risk-free interest rate 0.29% Dividend yield —% Volatility 56.09% Simulation term 4 years Forfeiture rate —% The Company recorded approximately $1.0 million, $1.0 million and $0.2 million of stock compensation expense relating to the TSR Performance Units for the years ended March 31, 2023, 2022 and 2021, respectively, included in general and administrative expenses reported on the Company’s Consolidated Statements of Operations. As of March 31, 2023 and 2022, there was approximately $2.3 million and $2.3 million, respectively, of unvested compensation expense for the outstanding performance-based restricted stock units related to the February 1, 2021 TSR Performance Units, which is expected to be recognized over a weighted average period of 1.93 years and 2.93 years, respectively. Stock Options A summary of Stock Option activity for the year ended March 31, 2023 is as follows: Options Weighted Average Exercise Price Weighted Average Contractual Term Aggregate Intrinsic Value Options outstanding at March 31, 2022 1,006,241 $ 32.98 Options granted 476,208 49.39 Options exercised (79,500) 22.86 Options forfeited/expired — — Options outstanding at March 31, 2023 1,402,949 $ 39.12 6.17 $ 5,128,070 Exercisable at March 31, 2023 746,371 $ 29.25 3.66 $ 5,128,070 Total vested or expected to vest at March 31, 2023 1,400,235 $ 39.11 6.17 $ 5,128,070 On December 2, 2022, the Compensation Committee approved the grant of a stock option to the Company’s President and Chief Executive Officer and Executive Chairman for 77,102 and 154,203, respectively, shares of common stock at an exercise price of $49.39 per share. These option shares vest in four equal annual installments measured from the grant date based on the President and Chief Executive Officer and Executive Chairman’s continued services to the Company. The Black-Scholes option model requires weighted average assumptions to be used for the calculation of the Company’s stock compensation expense. The assumptions used for this grant were: the expected life of the award was 5.43 years; the risk free interest rate was 3.62%; the expected volatility rate was 50.80%; the expected dividend yield was 0.0%; and the expected forfeiture rate was 0%. On May 17, 2022, the Compensation Committee approved the grant of a stock option to the Company’s President and Chief Executive Officer for 122,449 shares of common stock at an exercise price of $49.39 per share. These option shares vest in four equal annual installments measured from the grant date based on the President and Chief Executive Officer’s continued services to the Company. The Black-Scholes option model requires weighted average assumptions to be used for the calculation of the Company’s stock compensation expense. The assumptions used for this grant were: the expected life of the award was 5.43 years; the risk free interest rate was 2.95%; the expected volatility rate was 51.60%; the expected dividend yield was 0.0%; and the expected forfeiture rate was 0%. On September 7, 2021, the Compensation Committee approved the grant of a stock option to the Company’s Executive Chairman for 65,768 shares of common stock at an exercise price of $60.92 per share. These option shares vest in three equal annual installments measured from the grant date based on the Executive Chairman’s continued services to the Company. The Black-Scholes option model requires weighted average assumptions to be used for the calculation of the Company’s stock compensation expense. The assumptions used for this grant were: the expected life of the award was 5.92 years; the risk free interest rate was 0.96%; the expected volatility rate was 53.45%; the expected dividend yield was 0.0%; and the expected forfeiture rate was 0%. On August 23, 2021, the Compensation Committee approved the grant of a stock option to the Company’s President and Chief Executive Officer for 100,000 shares of common stock at an exercise price of $57.00 per share. These option shares vest in four equal annual installments measured from the grant date based on the President and Chief Executive Officer’s continued services to the Company. The Black-Scholes option model requires weighted average assumptions to be used for the calculation of the Company’s stock compensation expense. The assumptions used for this grant were: the expected life of the award was 6.02 years; the risk free interest rate was 0.92%; the expected volatility rate was 53.18%; the expected dividend yield was 0.0%; and the expected forfeiture rate was 0%. In May 2021, the Company reacquired 20,132 shares when a participant surrendered already-owned shares of the Company’s common stock to cover the exercise price of an outstanding stock option exercised by the participant. The 20,132 shares surrendered were constructively retired by the Company as of June 30, 2021, which resulted in the non-cash reduction of approximately $1.0 million in accumulated deficit on the Company’s Consolidated Statement of Stockholders’ Equity. The intrinsic value of stock options exercised was approximately $1.2 million, $29.5 million, and $5.0 million for the years ended March 31, 2023, 2022 and 2021, respectively. Additional information regarding stock options outstanding at March 31, 2023 is as follows: Exercise Number Outstanding Weighted Average Remaining Weighted Average Options Exercisable Weighted Average Exercise-Price $ 20.00 — $ 20.00 164,000 1.19 $ 20.00 164,000 $ 20.00 20.01 — 46.23 515,085 4.07 27.79 483,835 27.36 46.24 — 72.85 723,864 8.80 51.52 98,536 53.92 1,402,949 6.17 $ 39.12 746,371 $ 29.25 The Company recognizes compensation expense for stock options with a graded vesting schedule using an accelerated method over the explicit vesting period. The fair value of stock options granted is estimated on the date of grant using the Black-Scholes option valuation model. This stock-based compensation expense valuation model requires the Company to make assumptions and judgments regarding the variables used in the calculation. These variables include the expected term, the expected volatility of the Company’s common stock, expected risk-free interest rate, forfeiture rate and expected dividends. The Company calculates an expected term and volatility from the historical volatilities and terms of selected comparable public companies within its industry along with the Company’s short history regarding these variables. The risk-free interest rate is based on the U.S. Treasury yield curve in effect at the time of grant for periods corresponding with the expected life of the stock option. The Company estimates its forfeiture rate based on an analysis of its actual forfeitures and will continue to evaluate the appropriateness of the forfeiture rate based on actual forfeiture experience, analysis of employee turnover and other factors. The Company has never paid any cash dividends. Any future determination to pay dividends will be at the discretion of the Board and will depend on the Company’s financial condition, results of operations, capital requirements, restrictions contained in any financing instruments and such other factors as the Board deems relevant in its sole discretion. Therefore, the Company uses an expected dividend yield of zero in the option-pricing model. The following assumptions were used to calculate the fair value of stock options: Year Ended Year Ended Year Ended March 31, 2023 March 31, 2022 March 31, 2021 Risk-free interest rate 2.95% to 3.62% 0.92% to 0.96% 0.43% to 0.51% Dividend yield —% —% —% Volatility 50.80% to 51.60% 53.18% to 53.45% 53.41% to 52.43% Expected term 5.43 years 5.92 and 6.02 years 6.07 years Forfeiture rate —% to 3% —% —% to 2% Weighted-average grant-date fair value per option granted $ 49.39 $ 58.56 $ 42.04 Stock compensation expense related to the amortization of the fair value of service-based stock options issued was approximately $5.6 million, $2.6 million and $1.3 million, respectively, for the years ended March 31, 2023, 2022 and 2021 which was included in general and administrative reported on the Company’s Consolidated Statements of Operations. The weighted average fair value for the stock option awards granted for the year ended March 31, 2023 was $49.39 per share. As of March 31, 2023 and 2022, there was approximately $7.4 million and $4.1 million, respectively, of unrecognized compensation cost related to non-vested stock options granted under the Company’s stock option plans which is expected to be recognized over a weighted-average period of 1.68 years and 1.47 years, respectively. Performance-Based Stock Options A summary of the Performance-Based Stock Options for the year ended March 31, 2023 is as follows: Performance Options Weighted Average Exercise Price Performance Options outstanding at March 31, 2022 33,782 $ 46.85 Performance Options granted — — Performance Options exercised — — Performance Options forfeited/expired — — Performance Options outstanding at March 31, 2023 33,782 $ 46.85 The intrinsic value of performance stock options exercised was approximately $0.0 million, $0.2 million, and $0.0 million for the years ended March 31, 2023, 2022 and 2021, respectively. On February 28, 2020, the Company awarded 67,562 performance-based stock options. The performance goals are: (A) Target Goal : 50% of the shares vest upon (i) achievement by December 31, 2020 of a Final Order from the FCC providing for the creation and allocation of licenses for spectrum in the 900 MHz band consisting of paired blocks of contiguous spectrum, each containing at least 3 MHz of contiguous spectrum, authorized for broadband wireless communications uses and (ii) the lack of objection by the Board to the terms and conditions (including, but not limited to, the rebanding, clearing and relocation procedures, license assignment and award mechanisms and technical and operational rules) set forth or referenced in the Final Order; and (B) Stretch Goal : The remaining 50% of the performance shares vest and settle upon the occurrence of all three of the following conditions: (i) the Company enters into one or more long-term agreement(s) with critical infrastructure or enterprise business(es) to enable such business(es) to utilize the Company’s spectrum for broadband connectivity; (ii) the combined total contract dollars payable to the Company over the initial term(s) of such agreement(s) equals or exceeds a certain amount as specified by the Board; and (iii) the agreement(s) is/are binding on such business(es) and is/are either not contingent on prior Board approval(s) or such approval(s) has/have been received. As of December 30, 2020, not all of these conditions had been achieved, and therefore, the 33,780 performance-based stock option shares tied to the stretch goal expired unvested. Additionally, the Company awarded 14,635 performance-based stock options on February 28, 2020. The performance goal is: 100% of the shares will vest upon (i) achievement by December 31, 2020 of a Final Order from the FCC providing for the creation and allocation of licenses for spectrum in the 900 MHz band consisting of paired blocks of contiguous spectrum, each containing at least 3 MHz of contiguous spectrum, authorized for broadband wireless communications uses and (ii) the lack of objection by the Board to the terms and conditions (including, but not limited to, the rebanding, clearing and relocation procedures, license assignment and award mechanisms and technical and operational rules) set forth or referenced in the Final Order. For the years ended March 31, 2023 and 2022, there was no stock compensation expense recognized for the 33,782 performance-based stock options. For the year ended March 31, 2021, the Company recognized $0.8 million, included in general and administrative expenses reported on the Company’s Consolidated Statements of Operations, based on the achievement of the Target Goal under the performance-based stock options, upon the Report and Order becoming effective in August 2020. The weighted average fair value for the stock option awards granted for the fiscal year ended March 31, 2020 was $46.85 per share. As of March 31, 2023 and 2022, there was no unvested compensation expense relating to the outstanding performance-based stock options. Share Repurchase Program On September 29, 2021, the Board authorized a share repurchase program (the “share repurchase program”) pursuant to which the Company may repurchase up to $50.0 million of the Company’s common stock on or before September 29, 2023. The manner, timing and amount of any share repurchases will be determined by the Company based on a variety of factors, including price, general business and market conditions and alternative investment opportunities. The share repurchase program authorization does not obligate the Company to acquire any specific number of shares. Under the program, shares may be repurchased in privately negotiated and/or open market transactions, including under plans complying with Rule 10b5-1 under the Securities Exchange Act of 1934. The following table presents the share repurchase activity for Fiscal 2023, Fiscal 2022 and Fiscal 2021 (in thousands, except per share data): For the years ended March 31, 2023 2022 2021 Number of shares repurchased and retired 216 252 — Average price paid per share* $ 47.05 $ 57.50 $ — Total cost to repurchase $ 8,223 $ 14,962 $ — * Average price paid per share includes costs associated with the repurchases. As of March 31, 2023, $26.8 million is remaining under the share repurchase program. Motorola Investment On September 15, 2014, Motorola invested $10.0 million to purchase 500,000 Class B Units of the Company’s subsidiary, PDV Spectrum Holding Company, LLC (at a price equal to $20.00 per unit). The Company owns 100% of the Class A Units in the Subsidiary. Motorola had the right at any time to convert its 500,000 Class B Units into 500,000 shares of

Supplemental Disclosure of Cash

Supplemental Disclosure of Cash Flow Information	12 Months Ended
	Mar. 31, 2023
Supplemental Cash Flow Elements [Abstract]
Supplemental Disclosure of Cash Flow Information	Supplemental Disclosure of Cash Flow Information The following table summarizes the Company’s supplemental cash flow information: For the years ended March 31, (in thousands) 2023 2022 2021 Cash paid during the period: Taxes paid $ 14 $ 7 $ 61 Interest paid — — — Non-cash investing activity: Capitalized change in estimated asset retirement obligations $ (6) $ (17) $ 85 Network equipment provided in exchange for wireless licenses 36 120 61 Non-cash financing activities: Shares surrendered from stock option exercises $ — $ 1,000 $ — Equity payment of prior year accrued employee related expenses — — 1,537 During the year ended March 31, 2023, the Company was granted by the FCC, broadband licenses for 84 counties and relinquished to the FCC its narrowband licenses for the same 84 counties. This transaction resulted in a non-cash increase to intangibles of $38.4 million, which has been recorded as a non-cash gain on disposal of intangible assets of $38.4 million, for the year ended March 31, 2023. See Note 5 Intangible Assets for further discussion on the license exchanges. During the year ended March 31, 2022, the Company was granted by the FCC, broadband licenses for 21 counties and relinquished to the FCC its narrowband licenses for the same 21 counties. This transaction resulted in a non-cash increase to intangibles of $11.2 million, which has been recorded as a non-cash gain on disposal of intangible assets of $11.2 million, for the year ended March 31, 2022. See Note 5 Intangible Assets for further discussion on the license exchanges.

Contingencies

Contingencies	12 Months Ended
	Mar. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
Contingencies	Contingencies Contingent Liability In February 2021, the Company entered into an agreement with SDG&E to sell 900 MHz Broadband Spectrum throughout SDG&E’s California service territory, including San Diego and Imperial Counties and portions of Orange County (the “SDG&E Agreement”), for a total payment of $50.0 million. The SDG&E Agreement will support SDG&E’s deployment of a PLTE network for its California service territory, with a population of approximately 3.6 million people. Delivery of the relevant 900 MHz Broadband Spectrum and the associated broadband licenses by county to SDG&E commenced in Fiscal 2023 and is scheduled for completion before the end of fiscal year 2024. The total payment of $50.0 million is comprised of an initial payment of $20.0 million, received in February 2021, and the remaining $30.0 million payment, which is due through fiscal year 2024 as the Company delivers the relevant cleared 900 MHz Broadband Spectrum and the associated broadband licenses to SDG&E. In September 2022, the Company delivered to SDG&E 1.4 x 1.4 cleared 900 MHz Broadband Spectrum and the associated broadband license related to Imperial County and received a milestone payment of $0.2 million. A gain or loss on the sale of spectrum will be recognized for each county once the Company delivers the cleared 900 MHz Broadband Spectrum and the associated broadband licenses to SDG&E in full. As the Company is required to refund payments it has received in the event of termination or non-delivery of the specific county’s 900 MHz Broadband Spectrum, it recorded the $20.2 million received from SDG&E as contingent liability in the Company’s Consolidated Balance Sheet. As of March 31, 2023, the Company recorded the $20.2 million payments from SDG&E as a short-term liability due to the expected timing of delivery. Xcel Energy Guaranty In connection with Xcel Energy Agreement, the Company entered into a guaranty agreement, under which the Company guaranteed the delivery of the relevant 900 MHz Broadband Spectrum and the associated broadband licenses in Xcel Energy’s service territory in eight states along with other commercial obligations. In the event of default or non-delivery of the specific territory’s 900 MHz Broadband Spectrum, the Company is required to refund payments it has received. In addition, to the extent Anterix has performed any obligations, the Company’s liability and remaining obligations under the Xcel Energy Agreement will extend only to the remaining unperformed obligations. The Company recorded $8.0 million in deferred revenue in connection with the prepayment received as delivery of the relevant cleared 900 MHz Broadband licenses or counties is expected to commence in the first quarter of Fiscal 2024 through 2029. As of March 31, 2023, the maximum potential liability of future undiscounted payments under this agreement is approximately $8.0 million. Litigation In addition to commitments and obligations in the ordinary course of business as reflected in the lease footnote above, the Company may be subject, from time to time, to various claims and pending and potential legal actions arising out of the normal conduct of its business. The Company assesses contingencies to determine the degree of probability and range of possible loss for potential accrual in its financial statements. Because litigation is inherently unpredictable and unfavorable resolutions could occur, assessing litigation contingencies is highly subjective and requires judgments about future events. When evaluating contingencies, the Company may be unable to provide a meaningful estimate due to a number of factors, including the procedural status of the matter in question, the presence of complex or novel legal theories and/or the ongoing discovery and development of information important to the matters. In addition, damage amounts claimed in litigation against it may be unsupported, exaggerated or unrelated to possible outcomes, and as such are not meaningful indicators of its potential liability. The Company regularly reviews contingencies to determine the adequacy of its accruals and related disclosures. During the period presented, the Company has not recorded any accrual for loss contingencies associated with any claims or legal proceedings; determined that an unfavorable outcome is probable or reasonably possible; or determined that the amount or range of any possible loss is reasonably estimable. However, the outcome of legal proceedings and claims brought against the Company is subject to significant uncertainty. Therefore, although management considers the likelihood of a material adverse outcome to be remote, if one or more of these legal matters were resolved against the Company in a reporting period, the Company’s consolidated financial statements for that reporting period could be materially adversely affected. Pandemic and Macroeconomic Conditions In December 2020, the Company deferred payroll taxes under the Coronavirus Aid Relief and Economic Security Act, which was signed into law on March 27, 2020. The deferral amounted to approximately $0.3 million, which has assisted the Company in managing the financial impact caused by the pandemic. Of the total deferred, approximately $0.2 million was remitted to the IRS during Fiscal 2022, with the remaining amount remitted to the IRS during Fiscal 2023. Recent macroeconomic events, including the outbreak of COVID-19, inflation, and geopolitical matters, have increased operating costs and could increase production costs or result in delays in customer contracting or the availability of equipment necessary for the deployment of our target customers’ planned PLTE projects. The Company continues to closely monitor these risks. Although difficult to quantify, the Company believes the current macroeconomic environment, including inflation, may have an adverse effect on the Company’s target customers’ businesses, which may harm the Company’s commercialization efforts and negatively impact the Company’s revenues. If the Company is not able to control its higher operating costs or if the Company’s commercialization efforts are slowed or negatively impacted, continued periods of high inflation could have a material adverse effect on the Company’s business, operating results and financial condition.

Subsequent Events

Subsequent Events	12 Months Ended
	Mar. 31, 2023
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events LCRA Agreement In April 2023, the Company entered into an agreement with the Lower Colorado River Authority (“LCRA”) to sell 900 MHz Broadband Spectrum covering 68 counties and more than 30 cities in LCRA’s wholesale electric, transmission, and water service area (the “LCRA Agreement”) for total payments of $30.0 million plus the contribution of select LCRA 900 MHz narrowband spectrum. The LCRA Agreement will support LCRA’s deployment of a PLTE network which will provide a host of capabilities including grid awareness, communications and operational intelligence that will enhance resilience and spur innovation at LCRA.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Mar. 31, 2023
Accounting Policies [Abstract]
Basis of Presentation and Use of Estimates	Basis of Presentation and Use of Estimates The consolidated financial statements and accompanying notes are prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”), which require management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. The most significant estimates relate to estimated useful lives of depreciable assets, asset retirement obligations, valuation allowance on the Company’s deferred tax assets and recoverability of intangible assets. The Company is also required to make certain estimates with regard to the valuation of awards and forfeiture rates for its share-based award programs. Estimates and assumptions are reviewed periodically, and the effects of revisions are reflected in the financial statements in the applicable period. Accordingly, actual results could materially differ from those estimates. The accompanying consolidated financial statements include the accounts of the Company and its subsidiaries, including PDV Spectrum Holding Company, LLC formed in April 2014. All significant intercompany accounts and transactions have been eliminated in consolidation.
Cash and Cash Equivalents	Cash and Cash Equivalents All highly liquid investments with maturities of three months or less at the time of purchase are considered cash equivalents. Cash equivalents are stated at cost, which approximates the quoted market value and includes amounts held in money market funds.
Concentrations of Credit Risk	Concentrations of Credit Risk Financial instruments which potentially expose the Company to concentrations of credit risk consist primarily of cash and cash equivalents. The cash balance at times may exceed federally insured limits, however, the Company places its cash and temporary cash investments with financial institutions for which credit loss is not anticipated. As of March 31, 2023 and 2022, substantially all of the Company’s cash balance exceeded the federally insured limits.
Allowance for Doubtful Accounts	Allowance for Doubtful Accounts An allowance for uncollectible receivables is estimated, as required, based on a combination of write-off history, aging analysis and any specific known troubled accounts. The Company reviews its allowance for uncollectible receivables on a quarterly basis. Past due balances meeting specific criteria are reviewed individually for collectability.
Property and Equipment	Property and Equipment Property and equipment are stated at cost. Depreciation is computed using the straight-line method over the shorter of the estimated useful lives of the assets or the applicable lease term. The carrying amount at the balance sheet date of long-lived assets under construction in process includes assets purchased, constructed, or being developed internally that are not yet in service. Depreciation commences when the assets are placed in service. Depreciation rates for assets are updated periodically to account for changes, if any, in the estimated useful lives of the assets, lease terms, management’s strategic objectives, estimated residual values or obsolescence. Changes in estimates will result in adjustments to depreciation expense prospectively.
Accounting for Asset Retirement Obligations	Accounting for Asset Retirement Obligations An asset retirement obligation is evaluated and recorded as appropriate on assets for which the Company has a legal obligation to retire. The Company records a liability for an asset retirement obligation and the associated asset retirement cost at the time the underlying asset is acquired and put into service. Subsequent to the initial measurement of the asset retirement obligation, the obligation is adjusted at the end of each period to reflect the passage of time and changes in the estimated future cash flows underlying the obligation, if any. Over time, the liability is accreted to its present value and the capitalized cost is depreciated over the estimated useful life of the asset.
Intangible Assets	Intangible Assets Intangible assets are wireless licenses that are used to provide the Company with the exclusive right to utilize designated radio frequency spectrum to provide wireless communication services. While licenses are issued for only a fixed time, generally ten years, such licenses are subject to renewal by the FCC. License renewals have occurred routinely and at nominal cost in the past. There are currently no legal, regulatory, contractual, competitive, economic or other factors that limit the useful life of the Company’s wireless licenses. As a result, the Company has determined that the wireless licenses should be treated as an indefinite-lived intangible asset. The Company will evaluate the useful life determination for its wireless licenses each year to determine whether events and circumstances continue to support their treatment as an indefinite useful life asset. Evaluation of Indefinite-Lived Intangible Assets for Impairment Historically, wireless licenses were tested for impairment on an aggregate basis, consistent with the Company’s dispatch business at a national level. Effective for the year ended March 31, 2021 (“Fiscal 2021”), the Company determined that its unit of accounting should be based on geographic markets and deal markets. Unit of accounting of wireless licenses not associated with closed deals is based on geographic markets. Unit of accounting of wireless licenses associated with closed deals is based on the deal markets. The Company’s wireless licenses not associated with closed deals are tested for impairment based on the geographic markets, as the Company will be utilizing the existing wireless narrowband licenses, or broadband licenses if applicable, as part of facilitating broadband spectrum networks at a geographic market level. The Company’s wireless licenses associated with closed deals are tested for impairment based at the deal market level. The Company may elect to first perform a qualitative assessment to determine whether it is more likely than not that the fair value of an intangible asset is less than its carrying value. If the Company does not perform the qualitative assessment, or if the qualitative assessment indicates it is more likely than not that the fair value of the intangible asset is less than its carrying amount, the Company will calculate the estimated fair value of the intangible asset. If the estimated fair value of the spectrum licenses is lower than their carrying amount, an impairment loss is recognized. The Company will use a market-based approach to estimate fair value for impairment testing purposes. The valuation approach used to estimate fair value for the purpose of impairment testing requires management to use complex assumptions and estimates such as population, discount rates, industry and market considerations, long-term market equity risk, as well as other factors. These assumptions and estimates depend on our ability to accurately predict forward looking assumptions including successfully applying for broadband licenses, commercializing our 900 MHz Broadband Spectrum and properly estimating favorable deal terms over the life of the contract. For impairment testing, estimated fair value is determined using a market-based approach primarily using the 600 MHz auction price. As noted in the Report and Order, the FCC will use the spectrum price based on the average price paid in the FCC’s 600 MHz auction to calculate the Anti-Windfall Payments. During the year ended March 31, 2023 (“Fiscal 2023”), the Company shifted from a probability analysis approach to a more detailed approach with measurable qualitative metrics. The new approach, Demonstrated Intent (“DI”), determines how likely a deal is to close based on certain qualitative factors, like applying for an experimental license, entering into a request for proposal, joining certain utility board or publicly backing 900 MHz Broadband Spectrum and its application. As a result, the Company will utilize the DI scores on a go-forward basis for our impairment analysis. As of and for the year ended March 31, 2023, the Company performed a step one quantitative approach impairment test as of January 1, 2023, to determine if the fair value of the combined licenses by the associated geographical or deal market exceeds the carrying value for each geographical or deal market. During the year ended March 31, 2022 (“Fiscal 2022”), the Company changed the date of its annual impairment assessment from March 31, its fiscal year-end, to January 1. For the year ended March 31, 2022, the Company performed a step zero qualitative approach impairment test as of January 1, 2022, for each geographical market to test indefinite-lived intangible assets for impairment by first assessing qualitative factors to determine whether it is more-likely-than-not that the fair value of an indefinite-lived intangible asset is impaired as a basis for determining whether it is necessary to perform quantitative impairment testing. As a result of the step zero test, the Company was not required to perform a step one analysis. For the year ended March 31, 2021, the Company performed a step one quantitative impairment test to determine if the fair value of the combined licenses by the associated geographical or deal market exceeds the carrying value for each geographical or deal market. Based on the results of the impairment tests, there were no impairment charges recorded during the years ended March 31, 2023, 2022 and 2021. Exchanges of Intangible Assets At times, the Company enters into agreements to exchange or cancel spectrum licenses. Upon entering into the arrangement, if the transaction has been deemed to have commercial substance, spectrum licenses are reviewed for impairment. The licenses are exchanged or cancelled at their carrying value and adjusted for any gain or loss recognized. Upon receipt of FCC approval, the spectrum licenses acquired as part of an exchange of nonmonetary assets are recorded at their new accounting basis, for those acquired from the FCC, or fair value for those acquired from third party, (collectively, the “acquired basis”). The difference between the acquired basis of the spectrum licenses obtained, carrying value of the spectrum licenses transferred and cash paid, if any, is recognized as a gain or loss on disposal of spectrum licenses reported separately on the Company’s Consolidated Statements of Operations. The acquired basis of spectrum licenses is based on information for which there is little or no observable market data. If the transaction lacks commercial substance or the acquired basis is not measurable, the acquired spectrum licenses are recorded at the carrying value of the spectrum assets transferred, cancelled or exchanged. For the purpose of the valuation of broadband licenses received in connection with nonmonetary exchanges, the Company utilizes the 600 MHz Auction price per MHzPop, as defined in the Report and Order, which is considered the accounting basis for the new broadband licenses.
Long-Lived Asset and Right of Use Asset Impairment	Long-Lived Assets and Right of Use Assets ImpairmentThe Company evaluates long-lived assets, including right of use assets, other than intangible assets with indefinite lives, for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset group may not be recoverable. Asset groups are determined at the lowest level for which identifiable cash flows are largely independent of cash flows of other groups of assets and liabilities. When the carrying amount of the asset groups are not recoverable and exceeds its fair value, an impairment loss is recognized equal to the excess of the asset group’s carrying value over the estimated fair value.
Fair Value Measurement of Financial Instruments	Fair Value Measurement A Level 1, Level 2 or Level 3 fair value hierarchy is used to categorize fair value amounts depending on the quality of inputs used to measure the fair value. Level 1 fair value derived inputs utilize quoted prices in active markets for identical assets or liabilities. Level 2 fair value derived inputs are based on quoted prices for similar assets and liabilities in active markets or based on inputs other than quoted prices for the assets or liability that are either directly or indirectly observable. Level 3 fair value derived inputs are unobservable for the asset or liability as a result of little, if any, market activity for the asset or liability. The Company uses appropriate valuation techniques for the fair values of the applicable assets or liabilities based on the available inputs. When available, the Company measures fair value using Level 1 inputs as they generally provide the most reliable evidence of fair value. The inputs may fall into different levels within the hierarchy in some valuations. In these cases, the fair value hierarchy of the asset or liability level is based on the lowest level of input that is significant to the fair value measurements. Financial Instruments Financial instruments, including cash and cash equivalents, accounts receivable, accounts payable and accrued expenses are carried at cost, which management believes approximates fair value because of the short-term maturity of these instruments.
Leases	Leases Leases in which the Company is the lessee are comprised of corporate office space and tower space. Substantially all of the leases are classified as operating leases. The Company is obligated under certain lease agreements for office space with lease terms expiring on various dates from October 31, 2023 through June 30, 2027, which includes lease extensions ranging from three In accordance with Financial Accounting Standards Board, (“FASB”) Accounting Standards Codification, Leases (“ASC 842”), the Company recognized right of use (“ROU”) assets and corresponding lease liabilities on the Company’s Consolidated Balance Sheets for its operating lease agreements with contractual terms greater than 12 months. Lease liabilities are based on the present value of remaining lease payments over the lease term. As the discount rate implied in the Company’s leases is not readily determinable, the present value is calculated using the Company’s incremental borrowing rate, which is estimated to approximate the interest rate on a collateralized basis with similar terms.
Revenue Recognition	Revenue Recognition Revenues are recognized when a contract with a customer exists and control of the promised goods or services is transferred to the Company’s customers, in an amount that reflects the consideration it expects to be entitled to in exchange for those goods or services and the identified performance obligation has been satisfied. A performance obligation is a promise in a contract to transfer a distinct good or service to the customer and is the unit of account in Accounting Standards Codification, Revenue from Contracts with Customers (“ASC 606”). A contract’s transaction price is allocated to each distinct performance obligation and is recognized as revenue when, or as, the performance obligation is satisfied, which typically occurs when the services are rendered. Determining whether products and services are considered distinct performance obligations that should be accounted for separately versus together may require significant judgment. The Company’s contracts with customers may include multiple performance obligations. For such arrangements, the Company allocates revenue to each performance obligation based on its relative standalone selling price. It generally determines standalone selling prices based on the prices charged to customers under contracts involving only the relevant performance obligation. Judgment may be used to determine the standalone selling prices for items that are not sold separately, including services provided at no additional charge. For the Company’s customer agreements, most of the performance obligations involve delivering leased spectrum on a county-by-county basis and are generally satisfied over time as services are provided. The nature of the licenses provide the benefit of the leased spectrum regardless of whether the customer uses the spectrum or not. As a result, revenue will be recognized ratably as the Company delivers cleared 900 MHz Broadband Spectrum and the associated broadband licenses to the customer on a county-by-county basis over the contractual term. See Note 3 Revenue for a discussion of the Company’s recognized revenues during the years ended March 31, 2023, 2022 and 2021.
Direct Cost of Revenue	Direct Cost of Revenue The Company’s historical direct cost of revenue related to its TeamConnect service offering includes the costs of operating its dispatch network and its cloud-based solutions. With respect to sales of its historical software applications through its wireless carrier partners, direct cost of revenue includes the portion of service revenue retained by its domestic Tier 1 carrier or reseller partners pursuant to its agreements with these parties, which may include network services, connectivity, SMS service, sales, marketing, billing and other ancillary services.
Contract Assets and liabilities	Contract Assets and liabilities The Company recognizes a contract asset for the incremental costs of obtaining a contract with a customer. These costs include sales commissions, equity compensation and other costs associated with acquiring customer contracts. These costs are amortized ratably using the portfolio approach over the estimated customer contract period. The Company will review the contract asset on a periodic basis to determine if an impairment exists and will review the contract assets for potential credit loss exposure. If it is determined that there is an impairment, or a potential credit loss, the Company will expense the contract asset. Contract liabilities primarily relate to advance consideration received from customers for spectrum services, for which revenue is recognized over time, as the services are performed. These contract liabilities are recorded as deferred revenue on the balance sheet.
Product Development Costs	Product Development Costs The Company charges all product and development costs to expense as incurred. Types of expense incurred in product and development costs include employee compensation, consulting, travel, equipment and technology costs.
Advertising and Promotional Expense	Advertising and Promotional ExpenseThe Company expenses advertising and promotional costs as incurred.
Stock Compensation	Stock Compensation The Company accounts for stock options in accordance with U.S. GAAP, which requires the measurement and recognition of compensation expense, based on the estimated fair value of awards granted to consultants, employees and directors. The Company estimates the fair value of share-based awards on the date of grant using an option-pricing model. The value of the portion of the award that is ultimately expected to vest is recognized as expense in the Company’s statements of operations over the requisite service periods. In the event the participant’s employment by or engagement with (as a director or otherwise) the Company terminates before exercise of the options granted, the stock options granted to the participant shall immediately expire and all rights to purchase shares thereunder shall immediately cease and expire and be of no further force or effect, other than applicable exercise rights for vested shares that may extend past the termination date as provided for in the participant’s applicable option award agreement. Additionally, the Company’s Compensation Committee (the “Compensation Committee”) adopted an Executive Severance Plan (the “Severance Plan”) in February 2015, which was amended in February 2019, and the Company subsequently entered into Severance Plan Participation Agreements with its executive officers. In addition to providing participants with severance payments, the Severance Plan provides for accelerated vesting and extends the exercise period for outstanding equity awards if the Company terminates a participant’s service for reasons other than cause, death or disability or the participant terminates his or her service for good reason, whether before or after a change of control (each of such terms as defined in the Severance Plan). In addition to the Severance Plan, the equity awards issued to the Company’s President and Chief Executive Officer provide for accelerated vesting upon termination of service for reasons other than cause or a resignation for good reason; involuntary termination in connection with a change in control; or a change in control with a purchase price at or above $100 per share (each of such terms defined in the equity award agreements). To calculate option-based compensation, the Company uses the Black-Scholes option-pricing model. The Company’s determination of fair value of option-based awards on the date of grant using the Black-Scholes model is affected by assumptions regarding a number of subjective variables. The compensation cost for the stock options with a graded vesting schedule is recognized on an accelerated method over the vesting period. The fair value of restricted stock, restricted stock units and performance units without market conditions are measured based upon the quoted closing market price for the stock on the date of grant. The compensation cost for the restricted stock and restricted stock units is recognized on a straight-line basis over the vesting period. The compensation cost for the performance units without market conditions is recognized when the performance criteria are expected to be complete. The Company uses a Monte Carlo simulation model to determine the fair value of performance units with market condition at grant date. The Monte Carlo simulation model is based on a discounted cash flow approach, with the simulation of a large number of possible stock price outcomes for the Company’s stock and the target composite index. The use of the Monte Carlo simulation model requires the input of a number of assumptions including expected volatility of the Company’s stock price, which is based on the weighted-average historical volatility of its stock; correlation between changes in the Company’s stock price and changes in the target composite index, which is based on the historical relationship between the Company’s stock price and the target composite index average; risk-free interest rate, which is based on the treasury zero-coupon yield appropriate for the term of the performance unit as of the grant date; and expected dividends as applicable, which is zero, as the Company has never paid any cash dividends. Any future determination to pay dividends will be at the discretion of the board of directors (the “Board”) and will depend on the Company’s financial condition, results of operations, capital requirements, restrictions contained in any financing instruments and such other factors as the Board deems relevant in its sole discretion. Therefore, the Company has used an expected dividend yield of zero in the Monte Carlo simulation model. No tax benefits have been attributed to the share-based compensation expense because the Company maintains a full valuation allowance for all net deferred tax assets. All excess tax benefits and tax deficiencies, including tax benefits of dividends on share-based payment awards, are recognized as income tax expense or benefit in the income statement, eliminating the notion of the additional paid-in capital (“APIC”) pool. The excess tax benefits are classified as operating activities along with other income tax cash flows rather than financing activities in the statement of cash flows. The tax effects of exercised or vested awards are treated as discrete items in the reporting period in which they occur. Cash payments to tax authorities in connection with shares withheld to meet statutory tax withholding requirements are presented as a financing activity in the statement of cash flows. Retirement of common stock From time to time, the Company may acquire its common stock through share repurchases or option exercise swaps and return these shares to authorized and unissued. If the Company elects to retire these shares, the Company’s policy is to allocate a portion of the repurchase price to par value of common stock with the excess over par value allocated to accumulated deficit.
Income Taxes	Income Taxes The Company utilizes the asset and liability method of accounting for income taxes. Under this method, deferred tax assets and liabilities are recognized for the expected future tax consequences of temporary differences between the carrying amounts and the tax bases of assets and liabilities as well as from net operating loss and tax credit carryforwards. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in operations in the period that includes the enactment date. A valuation allowance is established when it is estimated that it is more likely than not that the tax benefit of a deferred tax asset will not be realized.
Accounting for Uncertainty in Income Taxes	Accounting for Uncertainty in Income Taxes The Company recognizes the effect of tax positions only when they are more likely than not to be sustained. Management has determined that the Company had no uncertain tax positions that would require financial statement recognition or disclosure. The Company is no longer subject to U.S. federal, state or local income tax examinations for periods prior to 2019. When applicable, the Company recognizes interest and penalties related to unrecognized tax benefits as a component of income tax expense.
Net Loss Per Share of Common Stock	Net Loss Per Share of Common StockBasic net loss per common share is calculated by dividing the net loss attributable to common stockholders by the weighted-average number of common shares outstanding during the period, without consideration for potentially dilutive securities. For purposes of the diluted net loss per share calculation, preferred stock, convertible notes payable-affiliated entities, stock options, restricted stock and warrants are considered to be potentially dilutive securities.
Recently Issued Accounting Pronouncements	Recently Issued Accounting Pronouncements While there have been accounting standards that have been issued or proposed by the FASB or other standard-setting bodies that do not require adoption until a future date, these updates are not expected to have a material impact on the Company’s consolidated financial statements upon adoption .

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Mar. 31, 2023
Accounting Policies [Abstract]
Summary of Changes in Liability For Asset Retirement Obligations	Changes in the liability for the asset retirement obligations for the years ended March 31, 2023 and 2022 are summarized below (in thousands): 2023 2022 Balance at beginning of the year $ 626 $ 749 Liabilities settled (79) (109) Revision of estimate (6) (17) Accretion expense 2 3 Balance at end of the year 543 626 Less amount classified as current - included in accounts payable and accrued expenses 30 85 Noncurrent liabilities - included in other liabilities $ 513 $ 541
Valuation Allowance	Changes in valuation allowance for the years ended March 31, 2023, 2022 and 2021 are summarized below (in thousands): 2023 2022 2021 Balance at beginning of the year $ 79,998 $ 65,304 $ 47,664 Charged to costs and expenses 1,218 979 124 Changes in net loss carryforward and other 4,768 13,715 17,516 Balance at end of the year $ 85,984 $ 79,998 $ 65,304

Revenue (Tables)

Revenue (Tables)	12 Months Ended
	Mar. 31, 2023
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	The following table provides information regarding the Company’s revenue for each of the services it provides pursuant to its spectrum revenue agreements for the years ended March 31, 2023, 2022 and 2021 (in thousands): 2023 2022 2021 Spectrum revenues 900 MHz Broadband Spectrum Revenue Ameren $ 609 $ 355 $ — Evergy (1) 581 — — Narrowband Spectrum Revenue Motorola 729 729 729 Total spectrum revenue (2) $ 1,919 $ 1,084 $ 729 Services revenue — — 192 Total operating revenues $ 1,919 $ 1,084 $ 921 1. The Company commenced revenue recognition in connection with the delivery of cleared 900 MHz Broadband Spectrum and the associated broadband licenses to Evergy for 81 counties.
Schedule of Contract Assets	The following table presents the activity for the Company’s contract assets (in thousands): 2023 2022 Balance at the beginning of the year $ 638 $ 381 Additions 249 263 Amortization (17) (6) Impairment — — Balance at the end of the year 870 638 Less amount classified as current assets - prepaid expenses and other current assets (418) (238) Noncurrent assets - included in other assets $ 452 $ 400
Schedule of Contract Liabilities	The following table presents the activity for the Company’s contract liabilities (in thousands): 2023 2022 Balance at the beginning of the year $ 54,678 $ 2,983 Additions 8,000 52,779 Revenue recognized (1,919) (1,084) Balance at the end of the year 60,759 54,678 Less amount classified as current liabilities (2,769) (1,478) Noncurrent liabilities $ 57,990 $ 53,200

Property and Equipment (Tables)

Property and Equipment (Tables)	12 Months Ended
	Mar. 31, 2023
Property, Plant and Equipment [Abstract]
Components of Property and Equipment	Property and equipment consists of the following at March 31, 2023 and 2022 (in thousands): Estimated 2023 2022 Network sites and equipment 5-10 years $ 12,292 $ 14,588 Computer software 1-7 years 847 639 Computer equipment 5-7 years 279 204 Furniture and fixture and other equipment 2-5 years 450 415 Leasehold improvements Shorter of the lease term or 10 years 819 242 14,687 16,088 Less accumulated depreciation 11,628 13,379 3,059 2,709 Construction in process 547 240 Property and equipment, net $ 3,606 $ 2,949

Intangible Assets (Tables)

Intangible Assets (Tables)	12 Months Ended
	Mar. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Indefinite-Lived Intangible Assets	Intangible assets consist of the following at March 31, 2023 and 2022 (in thousands): Wireless Licenses Balance at March 31, 2021 $ 122,117 Acquisitions 17,843 Exchanges - licenses received 15,341 Exchanges - licenses surrendered (4,132) Balance at March 31, 2022 151,169 Acquisitions 12,476 Exchanges - licenses received 46,174 Exchanges - licenses surrendered (7,775) Balance at March 31, 2023 $ 202,044
Schedule of Acquired Finite-Lived Intangible Assets by Major Class	The purchases of intangible assets, including refundable deposits, consisted of the following activity during the years March 31, 2023, 2022 and 2021 (in thousands): 2023 2022 2021 Refundable deposits * $ 6,492 $ 5,621 $ (1,986) Retuning cost and Swaps 6,036 2,894 290 Purchases and Anti-Windfall Payments 12,476 17,843 15,640 Total $ 25,004 $ 26,358 $ 13,944 * The decrease in refundable deposits during the year end 2021 was related to the exchange of narrowband license discussed below.

Accounts Payable and Accrued _2

Accounts Payable and Accrued Expenses (Tables)	12 Months Ended
	Mar. 31, 2023
Payables and Accruals [Abstract]
Schedule of Accounts Payable and Accrued Expenses	The table below provides additional information related to the Company’s accounts payable and accrued expenses at March 31, 2023 and 2022 (in thousands): 2023 2022 Accounts payable $ 755 $ 1,044 Accrued employee related expenses 4,271 4,730 Accrued expenses 1,267 735 Other 331 17 Total accounts payable and accrued expenses $ 6,624 $ 6,526

Leases (Tables)

Leases (Tables)	12 Months Ended
	Mar. 31, 2023
Leases [Abstract]
Additional Lease Cost Information	Weighted-average remaining lease term and discount rate for the Company’s operating leases are as follows: 2023 2022 Weighted average term - operating lease liabilities 2.87 years 3.57 years Weighted average incremental borrowing rate - operating lease liabilities 12 % 13 %
Lease Cost	For the years ended March 31, 2023, 2022 and 2021, the following table presents net lease cost (in thousands): 2023 2022 2021 Lease cost Operating lease cost (cost resulting from lease payments) $ 1,817 $ 1,950 $ 2,451 Short term lease cost 7 16 110 Sublease income — — (6) Net lease cost $ 1,824 $ 1,966 $ 2,555
Supplemental Lease Information	For the years ended March 31, 2023, 2022 and 2021, the following table presents other supplemental cash flow lease information (in thousands): 2023 2022 2021 Cash paid activity: Operating lease - operating cash flows (fixed payments) $ 2,217 $ 2,286 $ 2,746 Operating lease - operating cash flows (liability reduction) $ 1,042 $ 1,382 $ 1,674 Non-cash activity: Right of use assets obtained in exchange for new operating lease liabilities $ 165 $ 116 $ 230 The following table presents supplemental balance sheet information as of March 31, 2023 and 2022 (in thousands): 2023 2022 Non-current assets - right of use assets, net $ 3,371 $ 4,047 Current liabilities - operating lease liabilities $ 1,725 $ 1,512 Non-current liabilities - operating lease liabilities $ 2,922 $ 4,177
Future Minimum Payments	Future minimum payments under non-cancelable leases for office and tower spaces (exclusive of real estate tax, utilities, maintenance and other costs borne by the Company) for the remaining terms of the leases following the year ended March 31, 2023 are as follows (in thousands): Fiscal Year Operating 2024 $ 2,161 2025 1,701 2026 943 2027 521 2028 156 After 2027 20 Total future minimum lease payments 5,502 Amount representing interest (855) Present value of net future minimum lease payments $ 4,647

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Mar. 31, 2023
Income Tax Disclosure [Abstract]
Schedule of Net Deferred Tax Assets and Liabilities	Net deferred tax assets and liabilities consist of the following as of March 31, 2023 and 2022 (in thousands): 2023 2022 Deferred tax asset Property and equipment $ 724 $ 700 Accrued expenses 209 998 Deferred revenue 6,131 502 Asset retirement obligations 13 12 Net operating loss carryforward 81,908 81,818 Operating lease liabilities 1,312 1,434 Charitable contributions carryforward 64 60 Stock compensation expense 6,744 4,408 Total deferred tax asset 97,105 89,932 Deferred tax liability Right of use assets (821) (1,006) Indefinite-lived intangible assets (15,740) (13,120) Total deferred tax liability (16,561) (14,126) Total deferred tax assets and liabilities 80,544 75,806 Valuation allowance (85,984) (79,998) Net deferred tax assets and liabilities $ (5,440) $ (4,192)
Schedule of Components of Income Tax Expense	The components of the income tax expense for the years ended March 31, 2023, 2022 and 2021 are as follows (in thousands): 2023 2022 2021 Current: Federal $ — $ — $ — State 44 5 2 Total current* 44 5 2 Deferred: Federal 442 370 251 State 776 608 (127) Total deferred 1,218 978 124 Total income tax expense $ 1,262 $ 983 $ 126
Schedule of Effective Income Tax Rate Reconciliation	The differences between the United States federal statutory tax rate and the Company’s effective tax rate for the years ended March 31, 2023, 2022 and 2021 are as follows (in thousands): 2023 2022 2021 Statutory federal tax $ (3,162) 21 % $ (7,672) 21 % $ (11,405) 21 % State income taxes, net of federal benefit 814 -23 % 612 -2 % (125) 1 % Incentive stock option expense (27) 0 % (564) 2 % (720) 1 % Other permanent differences (62) 0 % (4,017) 11 % (251) 0 % 162M executive compensation limit 316 -2 % 1,673 -5 % 729 -1 % Restricted stock shortfall/windfall — 0 % (617) 2 % (136) 0 % Change in valuation allowance - Federal 3,314 -22 % 11,408 -31 % 14,570 -27 % Prior-year adjustments 69 0 % 160 -1 % (2,536) 5 % $ 1,262 -26 % $ 983 -3 % $ 126 0 %

Stock Acquisition Rights, Sto_2

Stock Acquisition Rights, Stock Options and Warrants (Tables)	12 Months Ended
	Mar. 31, 2023
Share-Based Payment Arrangement [Abstract]
Summary of Restricted Stock and Restricted Stock Units Activity	A summary of non-vested restricted stock activity for the year ended March 31, 2023 is as follows: Restricted Weighted Non-vested restricted stock outstanding at March 31, 2022 544,287 $ 47.39 Granted 255,912 47.85 Vested (214,029) 46.22 Forfeited (17,508) 50.92 Non-vested restricted stock outstanding at March 31, 2023 568,662 $ 47.93
Schedule of Restricted Stock Activity	The following table reflects activity related to our restricted stock for the years ended March 31, 2023, 2022 and 2021: 2023 2022 2021 Weighted-average grant-date fair value per unit granted $ 47.85 $ 50.64 $ 46.07 Fair value of restricted stock units vested (in thousands) $ 12,245 $ 12,240 $ 8,165
Summary of Performance Stock Activity	A summary of the performance-based restricted stock unit activity for the year ended March 31, 2023 is as follows: Performance Stock Weighted Performance stock outstanding at March 31, 2022 75,049 $ 58.65 Granted — — Vested — — Forfeited/cancelled — — Performance stock outstanding at March 31, 2023 75,049 $ 58.65
Schedule of Performance Shares Activity	The following table reflects activity related to our performance-based restricted stock units for the years ended March 31, 2023, 2022 and 2021: 2023 2022 2021 Weighted-average grant-date fair value per unit granted $ — $ — $ 58.65 Fair value of Performance stock units vested (in thousands) $ — $ — $ 3,941
Schedule of Assumptions used to Calculate Fair Value of Performance-Based Restricted Units	The following assumptions were used to calculate the grant date fair value of performance-based restricted units with market price condition using the Monte Carlo simulation model: February 1, 2021 Risk-free interest rate 0.29% Dividend yield —% Volatility 56.09% Simulation term 4 years Forfeiture rate —%
Summary of Stock Option Activity	A summary of Stock Option activity for the year ended March 31, 2023 is as follows: Options Weighted Average Exercise Price Weighted Average Contractual Term Aggregate Intrinsic Value Options outstanding at March 31, 2022 1,006,241 $ 32.98 Options granted 476,208 49.39 Options exercised (79,500) 22.86 Options forfeited/expired — — Options outstanding at March 31, 2023 1,402,949 $ 39.12 6.17 $ 5,128,070 Exercisable at March 31, 2023 746,371 $ 29.25 3.66 $ 5,128,070 Total vested or expected to vest at March 31, 2023 1,400,235 $ 39.11 6.17 $ 5,128,070
Schedule of Additional Information Regarding Stock Options Outstanding	Additional information regarding stock options outstanding at March 31, 2023 is as follows: Exercise Number Outstanding Weighted Average Remaining Weighted Average Options Exercisable Weighted Average Exercise-Price $ 20.00 — $ 20.00 164,000 1.19 $ 20.00 164,000 $ 20.00 20.01 — 46.23 515,085 4.07 27.79 483,835 27.36 46.24 — 72.85 723,864 8.80 51.52 98,536 53.92 1,402,949 6.17 $ 39.12 746,371 $ 29.25
Schedule of Assumptions used to Calculate Fair Value of Options	The following assumptions were used to calculate the fair value of stock options: Year Ended Year Ended Year Ended March 31, 2023 March 31, 2022 March 31, 2021 Risk-free interest rate 2.95% to 3.62% 0.92% to 0.96% 0.43% to 0.51% Dividend yield —% —% —% Volatility 50.80% to 51.60% 53.18% to 53.45% 53.41% to 52.43% Expected term 5.43 years 5.92 and 6.02 years 6.07 years Forfeiture rate —% to 3% —% —% to 2% Weighted-average grant-date fair value per option granted $ 49.39 $ 58.56 $ 42.04
Summary of Performance Stock Options	A summary of the Performance-Based Stock Options for the year ended March 31, 2023 is as follows: Performance Options Weighted Average Exercise Price Performance Options outstanding at March 31, 2022 33,782 $ 46.85 Performance Options granted — — Performance Options exercised — — Performance Options forfeited/expired — — Performance Options outstanding at March 31, 2023 33,782 $ 46.85
Share Repurchase Activity	The following table presents the share repurchase activity for Fiscal 2023, Fiscal 2022 and Fiscal 2021 (in thousands, except per share data): For the years ended March 31, 2023 2022 2021 Number of shares repurchased and retired 216 252 — Average price paid per share* $ 47.05 $ 57.50 $ — Total cost to repurchase $ 8,223 $ 14,962 $ — * Average price paid per share includes costs associated with the repurchases.

Supplemental Disclosure of Ca_2

Supplemental Disclosure of Cash Flow Information (Tables)	12 Months Ended
	Mar. 31, 2023
Supplemental Cash Flow Elements [Abstract]
Schedule of Cash Flow, Supplemental Disclosures	The following table summarizes the Company’s supplemental cash flow information: For the years ended March 31, (in thousands) 2023 2022 2021 Cash paid during the period: Taxes paid $ 14 $ 7 $ 61 Interest paid — — — Non-cash investing activity: Capitalized change in estimated asset retirement obligations $ (6) $ (17) $ 85 Network equipment provided in exchange for wireless licenses 36 120 61 Non-cash financing activities: Shares surrendered from stock option exercises $ — $ 1,000 $ — Equity payment of prior year accrued employee related expenses — — 1,537

Nature of Operations (Details)

Nature of Operations (Details) $ / shares in Units, $ in Thousands, people in Millions, customer in Millions

1 Months Ended

12 Months Ended

Oct. 28, 2022 USD ($) customer term

May 30, 2022 shares

May 18, 2022 $ / shares shares

Sep. 15, 2014 USD ($)

Sep. 30, 2022 USD ($)

Sep. 30, 2021 USD ($) people

Feb. 28, 2021 USD ($) people

Dec. 31, 2020 USD ($) people

Mar. 31, 2023 USD ($) county

Mar. 31, 2022 USD ($) county

Mar. 31, 2021 USD ($)

Mar. 31, 2024 USD ($)

Dec. 31, 2022 USD ($)

Sep. 30, 2014 USD ($)

Lessor, Lease, Description [Line Items]

Prepayments received

$ 60,759

$ 54,678

$ 2,983

Number of people covered by network | people

3.6

7.5

Lease term

30 years

Lease extension

10 years

10 years

Scheduled prepayments

$ 47,700

Broadband licenses granted, number of countries | county

84

21

Total operating revenues

$ 1,919

$ 1,084

921

Contingent liability

$ 20,000

0

20,000

Sale of stock (in shares) | shares

500,000

500,000

Shares converted (in shares) | shares

500,000

Prepaid expenses and other current assets

$ 16,277

10,147

Conversion price (in dollars per share) | $ / shares

$ 20

Common Class B Units | PDV Spectrum Holding Company, LLC

Lessor, Lease, Description [Line Items]

Equity method investee, cumulative proceeds received on all transactions

$ 10,000

Forecast

Lessor, Lease, Description [Line Items]

Contingent liability

$ 30,000

SDG&E

Lessor, Lease, Description [Line Items]

Consideration transferred

$ 50,000

Minimum

Lessor, Lease, Description [Line Items]

Lease extension

3 years

Spectrum revenue

Lessor, Lease, Description [Line Items]

Total operating revenues

$ 1,919

1,084

729

Prepaid expenses and other current assets

$ 7,500

Xcel Energy Services Inc. | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement

Lessor, Lease, Description [Line Items]

Agreement term

20 years

Number of agreement extensions | term

2

Agreement extension term

10 years

Total scheduled prepayments

$ 80,000

Prepayments received

$ 8,000

$ 8,000

Xcel Energy Services Inc. | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement | Electricity

Lessor, Lease, Description [Line Items]

Number of customers | customer

3.7

Xcel Energy Services Inc. | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement | Natural Gas

Lessor, Lease, Description [Line Items]

Number of customers | customer

2.1

Evergy

Lessor, Lease, Description [Line Items]

Number of people covered by network | people

3.9

Lease term

20 years

Scheduled prepayments

$ 30,200

Broadband licenses granted, number of countries | county

81

Evergy | Spectrum revenue

Lessor, Lease, Description [Line Items]

Total operating revenues

$ 581

$ 0

$ 0

SDG&E | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement

Lessor, Lease, Description [Line Items]

Milestone payment received

$ 200

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Narrative (Details)	12 Months Ended
	Mar. 31, 2023 USD ($) $ / shares shares	Mar. 31, 2022 USD ($) shares	Mar. 31, 2021 USD ($) shares	Sep. 30, 2021	Dec. 31, 2020
Summary Of Significant Accounting Policies [Line Items]
Liabilities settled	$ 79,000	$ 109,000
Capitalized change in estimated asset retirement obligations	$ (6,000)	(17,000)	$ 85,000
Wireless licenses term	10 years
Impairment charges	$ 0	0	0
Impairment of long-lived assets	0	0	$ 85,000
Property and equipment, net	3,606,000	$ 2,949,000
Lease extension				10 years	10 years
Tax benefits attributed to share-based compensation expense	$ 0
Potentially dilutive securities outstanding but excluded from computation of earnings per share | shares	352,000	1,343,000	1,382,000
Minimum
Summary Of Significant Accounting Policies [Line Items]
Lease extension	3 years
Accelerated vesting provision, change in control, purchase price (in dollars per share) | $ / shares	$ 100
Maximum
Summary Of Significant Accounting Policies [Line Items]
Lease extension	10 years
Advertising
Summary Of Significant Accounting Policies [Line Items]
Advertising and promotional expense	$ 92,000	$ 89,000	$ 19,000
Tier 1 Carrier Partner
Summary Of Significant Accounting Policies [Line Items]
Number of carriers			1
Customer Concentration Risk | Sales Revenue, Services, Net | Reseller
Summary Of Significant Accounting Policies [Line Items]
Number of resellers			1
Customer Concentration Risk | Sales Revenue, Services, Net | Domestic Carrier And Reseller
Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage			17%
Customer Concentration Risk | Accounts Receivable
Summary Of Significant Accounting Policies [Line Items]
Accounts receivable	0	0
Leased Premises
Summary Of Significant Accounting Policies [Line Items]
Liabilities settled	$ 100,000	$ 100,000
Network sites and equipment
Summary Of Significant Accounting Policies [Line Items]
Property and equipment, net			$ 0

Summary of Significant Accoun_5

Summary of Significant Accounting Policies - Summary of Changes in Liability For Asset Retirement Obligations (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance at beginning of the year	$ 626	$ 749
Liabilities settled	(79)	(109)
Revision of estimate	(6)	(17)	$ 85
Accretion expense	2	3
Balance at end of the year	543	626	$ 749
Asset Retirement Obligation [Abstract]
Less amount classified as current - included in accounts payable and accrued expenses	30	85
Noncurrent liabilities - included in other liabilities	$ 513	$ 541

Summary of Significant Accoun_6

Summary of Significant Accounting Policies - Valuation Allowance (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Change in Valuation Allowance [Roll Forward]
Balance at beginning of the year	$ 79,998	$ 65,304	$ 47,664
Charged to costs and expenses	1,218	979	124
Changes in net loss carryforward and other	4,768	13,715	17,516
Balance at end of the year	$ 85,984	$ 79,998	$ 65,304

Revenue - Disaggregation of Rev

Revenue - Disaggregation of Revenue (Details) $ in Thousands	12 Months Ended
	Mar. 31, 2023 USD ($) county	Mar. 31, 2022 USD ($) county	Mar. 31, 2021 USD ($)
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 1,919	$ 1,084	$ 921
Broadband licenses granted, number of countries | county	84	21
Spectrum revenue
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 1,919	$ 1,084	729
Service revenue
Disaggregation of Revenue [Line Items]
Total operating revenues	0	0	192
Ameren | Spectrum revenue
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 609	355	0
Evergy
Disaggregation of Revenue [Line Items]
Broadband licenses granted, number of countries | county	81
Evergy | Spectrum revenue
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 581	0	0
Motorola | Spectrum revenue
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 729	$ 729	$ 729

Revenue - Narrative (Details)

Revenue - Narrative (Details) $ in Thousands, people in Millions, customer in Millions		1 Months Ended
	Oct. 28, 2022 USD ($) customer term	Oct. 31, 2021 USD ($)	Sep. 30, 2021 USD ($) people	Feb. 28, 2021 USD ($) people	Dec. 31, 2020 USD ($) people	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Mar. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)	Sep. 30, 2014 USD ($)
Disaggregation of Revenue [Line Items]
Number of people covered by network | people				3.6	7.5
Lease term					30 years
Lease extension			10 years		10 years
Scheduled prepayments					$ 47,700
Contractual term					30 years	30 years
Days after agreement execution, payments due			30 days
Prepayments received						$ 60,759		$ 54,678	$ 2,983
Prepaid expenses and other current assets						16,277		$ 10,147
Spectrum revenue
Disaggregation of Revenue [Line Items]
Prepaid expenses and other current assets										$ 7,500
Ameren
Disaggregation of Revenue [Line Items]
Lease payments received		$ 17,200	$ 5,400	$ 300
Evergy
Disaggregation of Revenue [Line Items]
Number of people covered by network | people			3.9
Lease term			20 years
Scheduled prepayments			$ 30,200
Xcel Energy Services Inc. | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement
Disaggregation of Revenue [Line Items]
Agreement term	20 years
Number of agreement extensions | term	2
Agreement extension term	10 years
Total scheduled prepayments	$ 80,000
Prepayments received						$ 8,000	$ 8,000
Xcel Energy Services Inc. | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement | Electricity
Disaggregation of Revenue [Line Items]
Number of customers | customer	3.7
Xcel Energy Services Inc. | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement | Natural Gas
Disaggregation of Revenue [Line Items]
Number of customers | customer	2.1
Maximum
Disaggregation of Revenue [Line Items]
Lease extension						10 years
Contractual term						10 years

Revenue - Schedule of Contract

Revenue - Schedule of Contract Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Capitalized Contract Costs [Roll Forward]
Beginning balance	$ 638	$ 381
Additions	249	263
Amortization	(17)	(6)
Impairment	0	0
Ending balance	870	638
Capitalized Contract Cost, Net, Classified [Abstract]
Balance	870	638
Less amount classified as current assets - prepaid expenses and other current assets	(418)	(238)
Noncurrent assets - included in other assets	$ 452	$ 400

Revenue - Schedule of Contrac_2

Revenue - Schedule of Contract Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Contract with Customer, Liability [Roll Forward]
Beginning balance	$ 54,678	$ 2,983
Additions	8,000	52,779
Revenue recognized	(1,919)	(1,084)
Ending balance	60,759	54,678
Contract with Customer, Liability [Abstract]
Balance	60,759	54,678
Less amount classified as current liabilities	(2,769)	(1,478)
Noncurrent liabilities	$ 57,990	$ 53,200

Property and Equipment - Compon

Property and Equipment - Components of Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 14,687	$ 16,088
Less accumulated depreciation	11,628	13,379
Property and equipment, net before construction work in progress	3,059	2,709
Construction in process	547	240
Property and equipment, net	3,606	2,949
Network sites and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 12,292	14,588
Property and equipment, net			$ 0
Network sites and equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Network sites and equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	10 years
Computer software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 847	639
Computer software | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	1 year
Computer software | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	7 years
Computer equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 279	204
Computer equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Computer equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	7 years
Furniture and fixture and other equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 450	415
Furniture and fixture and other equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	2 years
Furniture and fixture and other equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Leasehold improvements
Property, Plant and Equipment [Line Items]
Estimated useful life	10 years
Property and equipment, gross	$ 819	$ 242

Property and Equipment - Narrat

Property and Equipment - Narrative (Details) - USD ($)	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Property, Plant and Equipment [Line Items]
Depreciation	$ 1,400,000	$ 1,500,000	$ 3,500,000
Impairment of long-lived assets	0	0	85,000
Property and equipment, net	$ 3,606,000	$ 2,949,000
Network sites and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, net			$ 0

Intangible Assets - Narrative (

Intangible Assets - Narrative (Details)	1 Months Ended		12 Months Ended
	Sep. 30, 2020 USD ($)	Aug. 31, 2020 USD ($)	Mar. 31, 2023 USD ($) channel county	Mar. 31, 2022 USD ($) county	Mar. 31, 2021 USD ($)	Jan. 31, 2020 channel	Jan. 31, 2018 USD ($)
Acquired Indefinite-lived Intangible Assets [Line Items]
Impairment charges			$ 0	$ 0	$ 0
Broadband licenses granted, number of countries | county			84	21
Gain (loss) from disposal of intangible assets, net			$ 38,399,000	$ 11,209,000	(3,849,000)
Prepayments received			60,759,000	54,678,000	2,983,000
Intangible assets			$ 202,044,000	151,169,000
Number of narrowband 900 MHz channels subject to relocation | channel			3			3
Reprogramming
Acquired Indefinite-lived Intangible Assets [Line Items]
Gain (loss) from disposal of intangible assets, net		$ (300,000)
AAR
Acquired Indefinite-lived Intangible Assets [Line Items]
Gain (loss) from disposal of intangible assets, net					(4,700,000)
Number of narrowband 900 MHz channels licensed | channel			6
Wireless Licenses
Acquired Indefinite-lived Intangible Assets [Line Items]
Licenses received			$ 46,174,000	15,341,000
Licenses exchanged			7,775,000	4,132,000
Intangible assets			$ 202,044,000	$ 151,169,000	$ 122,117,000
Spectrum Licenses
Acquired Indefinite-lived Intangible Assets [Line Items]
Gain (loss) from disposal of intangible assets, net	$ 1,100,000
Estimated fair value	200,000
Proceeds from sale of intangible assets	1,200,000
Prepayments received	600,000						$ 600,000
Intangible assets	$ 300,000

Intangible Assets - Schedule of

Intangible Assets - Schedule of Indefinite-Lived Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Indefinite-lived Intangible Assets [Roll Forward]
Beginning balance	$ 151,169
Ending balance	202,044	$ 151,169
Wireless Licenses
Indefinite-lived Intangible Assets [Roll Forward]
Beginning balance	151,169	122,117
Acquisitions	12,476	17,843
Exchanges - licenses received	46,174	15,341
Exchanges - licenses surrendered	(7,775)	(4,132)
Ending balance	$ 202,044	$ 151,169

Intangible Assets - Schedule _2

Intangible Assets - Schedule of purchase of intangible assets, including refundable deposits (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Acquired Finite-Lived Intangible Assets [Line Items]
Payments to acquire intangible assets	$ 25,004	$ 26,358	$ 13,944
Refundable Deposits
Acquired Finite-Lived Intangible Assets [Line Items]
Payments to acquire intangible assets	6,492	5,621	(1,986)
Retuning Costs and Swaps
Acquired Finite-Lived Intangible Assets [Line Items]
Payments to acquire intangible assets	6,036	2,894	290
Purchases and Anti-Windfall Payments
Acquired Finite-Lived Intangible Assets [Line Items]
Payments to acquire intangible assets	$ 12,476	$ 17,843	$ 15,640

Accounts Payable and Accrued _3

Accounts Payable and Accrued Expenses (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Mar. 31, 2022
Payables and Accruals [Abstract]
Accounts payable	$ 755	$ 1,044
Accrued employee related expenses	4,271	4,730
Accrued expenses	1,267	735
Other	331	17
Total accounts payable and accrued expenses	$ 6,624	$ 6,526

Related Party Transactions (Det

Related Party Transactions (Details) - USD ($)	1 Months Ended	12 Months Ended
	Jul. 31, 2022	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021	Aug. 27, 2020	Apr. 30, 2019
Related Party Transaction [Line Items]
Prepayments received		$ 60,759,000	$ 54,678,000	$ 2,983,000
Revenue recognized		1,919,000	1,084,000
TeamConnect LLC
Related Party Transaction [Line Items]
Ownership percentage						19.50%
Spectrum revenue
Related Party Transaction [Line Items]
Revenue recognized		700,000	700,000	700,000
Motorola
Related Party Transaction [Line Items]
Purchase of equipment		1,400,000	0	0
Payable to related parties		500,000	100,000
Motorola | Frequency Relocation Agreement
Related Party Transaction [Line Items]
Agreement amount		1,000,000
Expenses from transactions with related party		100,000
Rachelle B. Chong
Related Party Transaction [Line Items]
Consulting fees		100,000	100,000	100,000
Payable to related parties		0	0
Brian D. McAuley
Related Party Transaction [Line Items]
Consulting fees		40,000	40,000	23,000
Payable to related parties		$ 0	0
Extension term	12 months
Consulting agreement, cash compensation per year					$ 40,000
TeamConnect LLC
Related Party Transaction [Line Items]
Service fee term		24 months
TeamConnect LLC | PDVConnect
Related Party Transaction [Line Items]
Service fee term		48 months
Prepayments received		$ 0	0
Goosetown And A BEEP | PDVConnect
Related Party Transaction [Line Items]
Consulting fees		$ 55,000	$ 60,000	$ 600,000

Leases - Narrative (Details)

Leases - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021	Sep. 30, 2021	Dec. 31, 2020
Lease [Line Items]
Lease extension				10 years	10 years
Rent expense	$ 1.8	$ 2	$ 2.6
Cost of Revenue
Lease [Line Items]
Rent expense			1.2
Selling, General and Administrative Expenses
Lease [Line Items]
Rent expense			$ 1.4
Minimum
Lease [Line Items]
Lease extension	3 years
Maximum
Lease [Line Items]
Lease extension	10 years

Leases - Additional Lease Cost

Leases - Additional Lease Cost Information (Details)	Mar. 31, 2023	Mar. 31, 2022
Lease, Cost [Abstract]
Weighted average term - operating lease liabilities	2 years 10 months 13 days	3 years 6 months 25 days
Weighted average incremental borrowing rate - operating lease liabilities	12%	13%

Leases - Lease Cost (Details)

Leases - Lease Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Lease, Cost [Abstract]
Operating lease cost (cost resulting from lease payments)	$ 1,817	$ 1,950	$ 2,451
Short term lease cost	7	16	110
Sublease income	0	0	(6)
Net lease cost	$ 1,824	$ 1,966	$ 2,555

Leases - Supplemental Cash Flow

Leases - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Cash paid activity:
Operating lease - operating cash flows (fixed payments)	$ 2,217	$ 2,286	$ 2,746
Operating lease - operating cash flows (liability reduction)	1,042	1,382	1,674
Non-cash activity:
Right of use assets obtained in exchange for new operating lease liabilities	$ 165	$ 116	$ 230

Leases - Supplemental Balance S

Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Mar. 31, 2022
Leases [Abstract]
Non-current assets - right of use assets, net	$ 3,371	$ 4,047
Current liabilities - operating lease liabilities	1,725	1,512
Non-current liabilities - operating lease liabilities	$ 2,922	$ 4,177

Leases - Future Minimum Payment

Leases - Future Minimum Payments (Details) $ in Thousands	Mar. 31, 2023 USD ($)
Leases [Abstract]
2024	$ 2,161
2025	1,701
2026	943
2027	521
2028	156
After 2027	20
Total future minimum lease payments	5,502
Amount representing interest	(855)
Present value of net future minimum lease payments	$ 4,647

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Income Tax Disclosure [Line Items]
Deferred tax asset	$ 80,500	$ 75,800
Deferred tax liabilitiy	16,561	14,126
Deferred federal, state and local, tax expense (benefit)	800	(600)
Indefinite-lived Intangible Assets
Income Tax Disclosure [Line Items]
Deferred tax liabilitiy	5,400	4,200
Federal
Income Tax Disclosure [Line Items]
Net NOL carryforwards	327,800
Net operating loss carryforwards	90,300	330,700
Net operating loss carryforwards, no expiration	237,500	240,400
State
Income Tax Disclosure [Line Items]
Net NOL carryforwards	216,700
Net operating loss carryforwards	153,000	191,800
Net operating loss carryforwards, no expiration	$ 63,700	$ 37,300

Income Taxes - Schedule of Net

Income Taxes - Schedule of Net Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Deferred tax asset
Property and equipment	$ 724	$ 700
Accrued expenses	209	998
Deferred revenue	6,131	502
Asset retirement obligations	13	12
Net operating loss carryforward	81,908	81,818
Operating lease liabilities	1,312	1,434
Charitable contributions carryforward	64	60
Stock compensation expense	6,744	4,408
Total deferred tax asset	97,105	89,932
Deferred tax liability
Right of use assets	(821)	(1,006)
Indefinite-lived intangible assets	(15,740)	(13,120)
Total deferred tax liability	(16,561)	(14,126)
Valuation allowance	(85,984)	(79,998)	$ (65,304)	$ (47,664)
Net deferred tax assets and liabilities	(5,440)	(4,192)
Definite-Lived Intangible Assets
Deferred tax liability
Total deferred tax assets and liabilities	$ 80,544	$ 75,806

Income Taxes - Schedule of Comp

Income Taxes - Schedule of Components of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Current:
Federal	$ 0	$ 0	$ 0
State	44	5	2
Total current	44	5	2
Deferred:
Federal	442	370	251
State	776	608	(127)
Total deferred	1,218	978	124
Total income tax expense	$ 1,262	$ 983	$ 126

Income Taxes - Schedule of Effe

Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Statutory federal tax	$ (3,162)	$ (7,672)	$ (11,405)
State income taxes, net of federal benefit	814	612	(125)
Incentive stock option expense	(27)	(564)	(720)
Other permanent differences	(62)	(4,017)	(251)
162M executive compensation limit	316	1,673	729
Restricted stock shortfall/windfall	0	(617)	(136)
Prior-year adjustments	69	160	(2,536)
Total income tax expense	$ 1,262	$ 983	$ 126
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Statutory federal tax	21%	21%	21%
State income taxes, net of federal benefit	(23.00%)	(2.00%)	1%
Incentive stock option expense	0%	2%	1%
Other permanent differences	0%	11%	0%
162M executive compensation limit	(2.00%)	(5.00%)	(1.00%)
Restricted stock shortfall/windfall	0%	2%	0%
Prior-year adjustments	0%	(1.00%)	5%
Total income tax expense, percent	(26.00%)	(3.00%)	0%
Federal
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Change in valuation allowance - Federal	$ 3,314	$ 11,408	$ 14,570
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Change in valuation allowance - Federal	(22.00%)	(31.00%)	(27.00%)

Stock Acquisition Rights, Sto_3

Stock Acquisition Rights, Stock Options and Warrants - Narrative (Details)															1 Months Ended		12 Months Ended
	Dec. 02, 2022 installment $ / shares shares	May 30, 2022 shares	May 18, 2022 shares	May 17, 2022 installment $ / shares shares	Sep. 07, 2021 installment $ / shares shares	Aug. 23, 2021 installment $ / shares shares	Jun. 30, 2021 shares	Feb. 01, 2021 shares	Jan. 01, 2021 shares	Dec. 30, 2020 shares	Sep. 30, 2020 USD ($) shares	Jun. 24, 2020 shares	Feb. 28, 2020 shares	Sep. 15, 2014 USD ($) $ / shares shares	May 31, 2021 USD ($) shares	May 31, 2020 USD ($) shares	Mar. 31, 2023 USD ($) $ / shares shares	Mar. 31, 2022 USD ($) $ / shares shares	Mar. 31, 2021 USD ($) $ / shares shares	Mar. 31, 2020 $ / shares	Jun. 30, 2022 shares	Sep. 29, 2021 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
General and administrative																	$ 45,177,000	$ 39,525,000	$ 39,302,000
Product development																	4,439,000	3,593,000	4,343,000
Sales and support																	5,733,000	4,461,000	2,942,000
Non-cash compensation expense attributable to stock awards																	$ 17,874,000	$ 13,625,000	$ 15,925,000
Granted (in dollars per share) | $ / shares	$ 49.39			$ 49.39	$ 60.92	$ 57
Number of vesting installments | installment	4			4	3	4
Number of shares repurchased (in shares) | shares							20,132								20,132		216,000	252,000	0
Decrease in APIC															$ 1,000,000
Stock repurchase program, authorized amount																						$ 50,000,000
Stock repurchase program, remaining authorized repurchase amount																	$ 26,800,000
Sale of stock (in shares) | shares		500,000	500,000
Common Class B Units | PDV Spectrum Holding Company, LLC
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity method investee, cumulative proceeds received on all transactions														$ 10,000,000
Sale of stock (in shares) | shares														500,000
Sale of stock (in dollars per share) | $ / shares														$ 20
Common Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of units owned														100%
Shares registered for resale (in shares) | shares																					500,000
Common Class A | PDV Spectrum Holding Company, LLC
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Subsidiary equity units for which investor has right to convert to common stock (in shares) | shares														500,000
President and Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in shares) | shares	77,102			122,449	65,768	100,000
Executive Chairman
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in shares) | shares	154,203
Lease Agreements, 900 MHz [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense																	0	$ 100,000
Stock options, contractual life																		20 years
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense																$ 1,500,000	10,900,000	$ 9,700,000	$ 9,200,000
General and administrative																	9,800,000	8,500,000	8,400,000
Product development																	600,000	700,000	600,000
Sales and support																	$ 500,000	500,000	200,000
Plan modification, incremental cost																			800,000
Awards issued | shares																28,000	255,912
Unvested compensation expense																	$ 18,500,000	$ 18,400,000
Weighted average period of recognition of unrecognized compensation cost																	2 years 3 months 21 days	2 years 6 months 10 days
Awards forfeited | shares																	17,508
Performance-Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense																			$ 0
Awards issued | shares											91,216		95,538				0
Non-cash compensation expense attributable to stock awards											$ 4,300,000
Awards forfeited | shares																	0		47,768
Expected term								4 years
Expected volatility rate								56.09%
Risk-free interest rate								0.29%
Dividend yield								0%
Forfeiture rate								0%
Performance-Based Restricted Stock Units | First Anniversary
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of vesting for stock granted to employees													50%
Performance-Based Restricted Stock Units | Second Anniversary
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of vesting for stock granted to employees													50%
Performance-Based Restricted Stock Units | Cumulative Spectrum Proceeds Monetized | Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense																	$ 300,000	$ 300,000	$ 100,000
Unvested compensation expense																	$ 800,000	$ 800,000
Weighted average period of recognition of unrecognized compensation cost																	1 year 5 months 26 days	2 years 5 months 26 days
Measurement period												4 years
Vesting if target metric achieved (in shares) | shares												30,049
Performance-Based Restricted Stock Units | Cumulative Spectrum Proceeds Monetized | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage share payout																	0%
Performance-Based Restricted Stock Units | Cumulative Spectrum Proceeds Monetized | Minimum | Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting if target metric achieved (in shares) | shares												15,025
Performance-Based Restricted Stock Units | Cumulative Spectrum Proceeds Monetized | Maximum | Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage share payout																	200%
Vesting if target metric achieved (in shares) | shares												60,098
Performance-Based Restricted Stock Units | TSR | President and Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense																	$ 1,000,000	$ 1,000,000	$ 200,000
Unvested compensation expense																	$ 2,300,000	$ 2,300,000
Weighted average period of recognition of unrecognized compensation cost																	1 year 11 months 4 days	2 years 11 months 4 days
Vesting if target metric achieved (in shares) | shares								45,000
Performance-Based Restricted Stock Units | TSR | Minimum | President and Chief Executive Officer | First Anniversary
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of vesting for stock granted to employees								25%
Performance-Based Restricted Stock Units | TSR | Minimum | Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage share payout																	25%
Performance-Based Restricted Stock Units | TSR | Maximum | President and Chief Executive Officer | First Anniversary
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of vesting for stock granted to employees								350%
Performance-Based Restricted Stock Units | TSR | Maximum | Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage share payout																	350%
Performance-Based Restricted Stock Units | Additional
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards issued | shares													43,446
Performance-Based Restricted Stock Units | Additional | First Anniversary
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of vesting for stock granted to employees													100%
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average period of recognition of unrecognized compensation cost																	1 year 8 months 4 days	1 year 5 months 19 days
Options granted (in shares) | shares																	476,208
Granted (in dollars per share) | $ / shares																	$ 49.39
Expected term	5 years 5 months 4 days			5 years 5 months 4 days	5 years 11 months 1 day	6 years 7 days											5 years 5 months 4 days		6 years 25 days
Expected volatility rate	50.80%			51.60%	53.45%	53.18%
Risk-free interest rate	3.62%			2.95%	0.96%	0.92%
Dividend yield	0%			0%	0%	0%											0%	0%	0%
Forfeiture rate	0%			0%	0%	0%												0%
Intrinsic value of options exercised																	$ 1,200,000	$ 29,500,000	$ 5,000,000
Weighted average grant-date fair value per option granted (in dollars per share) | $ / shares																	$ 49.39	$ 58.56	$ 42.04
Unrecognized compensation cost related to non-vested share options granted																	$ 7,400,000	$ 4,100,000
Stock options outstanding | shares																	1,402,949	1,006,241
Stock Options | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term																	5 years 11 months 1 day
Expected volatility rate																	50.80%	53.18%	53.41%
Risk-free interest rate																	2.95%	0.92%	0.43%
Forfeiture rate																	0%		0%
Stock Options | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term																	6 years 7 days
Expected volatility rate																	51.60%	53.45%	52.43%
Risk-free interest rate																	3.62%	0.96%	0.51%
Forfeiture rate																	3%		2%
Service-Based Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense																	$ 5,600,000	$ 2,600,000	$ 1,300,000
Performance-Based Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested compensation expense																	$ 0	0
Options granted (in shares) | shares													67,562				0
Granted (in dollars per share) | $ / shares																	$ 0
Intrinsic value of options exercised																	$ 0	200,000	0
Weighted average grant-date fair value per option granted (in dollars per share) | $ / shares																				$ 46.85
Stock options forfeited (in shares) | shares										33,780
Consulting fees																	$ 0	$ 0	$ 800,000
Stock options outstanding | shares																	33,782	33,782
Performance-Based Stock Options | First Anniversary
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of vesting for stock granted to employees													50%
Performance-Based Stock Options | Second Anniversary
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of vesting for stock granted to employees													50%
Performance-Based Stock Options | Additional
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in shares) | shares													14,635
Performance-Based Stock Options | Additional | First Anniversary
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of vesting for stock granted to employees													100%
2014 Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock authorized and reserved for issuance (in shares) | shares																	5,027,201
Shares available | shares																	502,256
Percentage of increase in number of shares of common stock issued and outstanding									5%								5%
Additional common stock authorized and reserved for future issuance (in shares) | shares									879,216

Stock Acquisition Rights, Sto_4

Stock Acquisition Rights, Stock Options and Warrants - Summary of Restricted Stock and Restricted Stock Units Activity (Details) - Restricted Stock - $ / shares	1 Months Ended	12 Months Ended
	May 31, 2020	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Restricted Stock
Beginning stock outstanding (in shares)		544,287
Granted (in shares)	28,000	255,912
Vested (in shares)		(214,029)
Forfeited (in shares)		(17,508)
Ending stock outstanding (in shares)		568,662	544,287
Weighted Average Grant Day Fair Value
Beginning outstanding (in dollars per share)		$ 47.39
Granted (in dollars per share)		47.85	$ 50.64	$ 46.07
Vested (in dollars per share)		46.22
Forfeited (in dollars per share)		50.92
Ending outstanding (in dollars per share)		$ 47.93	$ 47.39

Stock Acquisition Rights, Sto_5

Stock Acquisition Rights, Stock Options and Warrants - Activity of Restricted Stock (Details) - Restricted Stock - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant-date fair value per unit granted (in dollars per share)	$ 47.85	$ 50.64	$ 46.07
Fair value of restricted stock units vested (in thousands)	$ 12,245	$ 12,240	$ 8,165

Stock Acquisition Rights, Sto_6

Stock Acquisition Rights, Stock Options and Warrants - Summary of Performance Stock Activity (Details) - Performance-Based Restricted Stock Units - $ / shares			12 Months Ended
	Sep. 30, 2020	Feb. 28, 2020	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Performance Stock
Beginning stock outstanding (in shares)			75,049
Granted (in shares)	91,216	95,538	0
Vested (in shares)			0
Forfeited (in shares)			0		(47,768)
Ending stock outstanding (in shares)			75,049	75,049
Weighted Average Grant Day Fair Value
Beginning outstanding (in dollars per share)			$ 58.65
Granted (in dollars per share)			0	$ 0	$ 58.65
Vested (in dollars per share)			0
Forfeited (in dollars per share)			0
Ending outstanding (in dollars per share)			$ 58.65	$ 58.65

Stock Acquisition Rights, Sto_7

Stock Acquisition Rights, Stock Options and Warrants - Activity of Performance-based Restricted Stock (Details) - Performance-Based Restricted Stock Units - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant-date fair value per unit granted (in dollars per share)	$ 0	$ 0	$ 58.65
Fair value of restricted stock units vested (in thousands)	$ 0	$ 0	$ 3,941

Stock Acquisition Rights, Sto_8

Stock Acquisition Rights, Stock Options and Warrants - Schedule of Assumptions used to Calculate Fair Value of Performance-Based Restricted Units (Details) - Performance-Based Restricted Stock Units	Feb. 01, 2021
Risk-free interest rate	0.29%
Dividend yield	0%
Volatility	56.09%
Simulation term	4 years
Forfeiture rate	0%

Stock Acquisition Rights, Sto_9

Stock Acquisition Rights, Stock Options and Warrants - Summary of Stock Option Activity (Details) - USD ($)					12 Months Ended
	Dec. 02, 2022	May 17, 2022	Sep. 07, 2021	Aug. 23, 2021	Mar. 31, 2023
Weighted Average Exercise Price
Granted (in dollars per share)	$ 49.39	$ 49.39	$ 60.92	$ 57
Stock Options
Options
Beginning options outstanding (in shares)					1,006,241
Options granted (in shares)					476,208
Options exercised (in shares)					(79,500)
Options forfeited/expired (in shares)					0
Ending options outstanding (in shares)					1,402,949
Exercisable at period end (in shares)					746,371
Total vested or expected to vest at period end (in shares)					1,400,235
Weighted Average Exercise Price
Beginning outstanding (in dollars per share)					$ 32.98
Granted (in dollars per share)					49.39
Exercised (in dollars per share)					22.86
Forfeited/expired (in dollars per share)					0
Ending outstanding (in dollars per share)					39.12
Exercisable at period end (in dollars per share)					29.25
Total vested and expected to vest (in dollars per share)					$ 39.11
Additional Disclosures [Abstract]
Weighted average contractual term, options outstanding					6 years 2 months 1 day
Weighted average contractual term, exercisable					3 years 7 months 28 days
Weighted average contractual term, total vested and expected to vest					6 years 2 months 1 day
Aggregate intrinsic value, options outstanding					$ 5,128,070
Aggregate intrinsic value, exercisable					5,128,070
Aggregate intrinsic value, total vested and expected to vest					$ 5,128,070

Stock Acquisition Rights, St_10

Stock Acquisition Rights, Stock Options and Warrants - Schedule of Additional Information Regarding Stock Options Outstanding (Details) - Stock Options	12 Months Ended
	Mar. 31, 2023 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number Outstanding (in shares) | shares	1,402,949
Weighted Average Remaining Life in Years	6 years 2 months 1 day
Weighted Average Exercise Price (in dollars per share)	$ 39.12
Options Exercisable (in shares) | shares	746,371
Weighted Average Exercise-Price of Share Exercisable (in dollars per share)	$ 29.25
$ 20.00 - 20.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise prices, minimum (in dollars per share)	20
Exercise prices, maximum (in dollars per share)	$ 20
Number Outstanding (in shares) | shares	164,000
Weighted Average Remaining Life in Years	1 year 2 months 8 days
Weighted Average Exercise Price (in dollars per share)	$ 20
Options Exercisable (in shares) | shares	164,000
Weighted Average Exercise-Price of Share Exercisable (in dollars per share)	$ 20
$ 20.01 - 46.23
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise prices, minimum (in dollars per share)	20.01
Exercise prices, maximum (in dollars per share)	$ 46.23
Number Outstanding (in shares) | shares	515,085
Weighted Average Remaining Life in Years	4 years 25 days
Weighted Average Exercise Price (in dollars per share)	$ 27.79
Options Exercisable (in shares) | shares	483,835
Weighted Average Exercise-Price of Share Exercisable (in dollars per share)	$ 27.36
$ 46.24 - 72.85
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise prices, minimum (in dollars per share)	46.24
Exercise prices, maximum (in dollars per share)	$ 72.85
Number Outstanding (in shares) | shares	723,864
Weighted Average Remaining Life in Years	8 years 9 months 18 days
Weighted Average Exercise Price (in dollars per share)	$ 51.52
Options Exercisable (in shares) | shares	98,536
Weighted Average Exercise-Price of Share Exercisable (in dollars per share)	$ 53.92

Stock Acquisition Rights, St_11

Stock Acquisition Rights, Stock Options and Warrants - Schedule of Assumptions used to Calculate Fair Value of Options (Details) - Stock Options - $ / shares					12 Months Ended
	Dec. 02, 2022	May 17, 2022	Sep. 07, 2021	Aug. 23, 2021	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Risk-free interest rate	3.62%	2.95%	0.96%	0.92%
Dividend yield	0%	0%	0%	0%	0%	0%	0%
Volatility	50.80%	51.60%	53.45%	53.18%
Expected term	5 years 5 months 4 days	5 years 5 months 4 days	5 years 11 months 1 day	6 years 7 days	5 years 5 months 4 days		6 years 25 days
Forfeiture rate	0%	0%	0%	0%		0%
Weighted average grant-date fair value per option granted (in dollars per share)					$ 49.39	$ 58.56	$ 42.04
Minimum
Risk-free interest rate					2.95%	0.92%	0.43%
Volatility					50.80%	53.18%	53.41%
Expected term					5 years 11 months 1 day
Forfeiture rate					0%		0%
Maximum
Risk-free interest rate					3.62%	0.96%	0.51%
Volatility					51.60%	53.45%	52.43%
Expected term					6 years 7 days
Forfeiture rate					3%		2%

Stock Acquisition Rights, St_12

Stock Acquisition Rights, Stock Options and Warrants - Summary of Performance Stock Options (Details) - $ / shares						12 Months Ended
	Dec. 02, 2022	May 17, 2022	Sep. 07, 2021	Aug. 23, 2021	Feb. 28, 2020	Mar. 31, 2023
Weighted Average Exercise Price
Granted (in dollars per share)	$ 49.39	$ 49.39	$ 60.92	$ 57
Performance-Based Stock Options
Options
Beginning options outstanding (in shares)						33,782
Options granted (in shares)					67,562	0
Options exercised (in shares)						0
Options forfeited/expired (in shares)						0
Ending options outstanding (in shares)						33,782
Weighted Average Exercise Price
Beginning outstanding (in dollars per share)						$ 46.85
Granted (in dollars per share)						0
Exercised (in dollars per share)						0
Forfeited/expired (in dollars per share)						0
Ending outstanding (in dollars per share)						$ 46.85

Stock Acquisition Rights, St_13

Stock Acquisition Rights, Stock Options and Warrants - Share Repurchase Activity (Details) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended	12 Months Ended
	Jun. 30, 2021	May 31, 2021	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Share-Based Payment Arrangement [Abstract]
Number of shares repurchased (in shares)	20,132	20,132	216,000	252,000	0
Average price paid per share (in dollars per share)			$ 47.05	$ 57.50	$ 0
Total cost to repurchase			$ 8,223	$ 14,962	$ 0

Supplemental Disclosure of Ca_3

Supplemental Disclosure of Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Supplemental Cash Flow Elements [Abstract]
Taxes paid	$ 14	$ 7	$ 61
Interest paid	0	0	0
Non-cash investing activity:
Capitalized change in estimated asset retirement obligations	(6)	(17)	85
Network equipment provided in exchange for wireless licenses	36	120	61
Non-cash financing activities:
Shares surrendered from stock option exercises	0	1,000	0
Equity payment of prior year accrued employee related expenses	$ 0	$ 0	$ 1,537

Supplemental Disclosure of Ca_4

Supplemental Disclosure of Cash Flow Information - Narrative (Details) $ in Thousands	12 Months Ended
	Mar. 31, 2023 USD ($) county	Mar. 31, 2022 USD ($) county	Mar. 31, 2021 USD ($)
Supplemental Cash Flow Elements [Abstract]
Broadband licenses granted, number of countries | county	84	21
Gain (loss) from disposal of intangible assets, net | $	$ 38,399	$ 11,209	$ (3,849)

Contingencies (Details)

Contingencies (Details) $ in Thousands, people in Millions	1 Months Ended
	Feb. 28, 2021 USD ($) people	Dec. 31, 2020 USD ($) people	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Mar. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)
Commitments And Contingencies [Line Items]
Number of people | people	3.6	7.5
Contingent liability	$ 20,000			$ 0		$ 20,000
Contingent liability				20,249		0
Prepayments received				60,759		54,678	$ 2,983
Accrued payroll taxes		$ 300				$ 200
Xcel Energy Services Inc. | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement
Commitments And Contingencies [Line Items]
Prepayments received				$ 8,000	$ 8,000
SDG&E
Commitments And Contingencies [Line Items]
Consideration transferred	$ 50,000
Forecast
Commitments And Contingencies [Line Items]
Contingent liability			$ 30,000

Subsequent Events (Details)

Subsequent Events (Details) $ in Thousands		12 Months Ended
	Apr. 20, 2023 USD ($) cities county	Mar. 31, 2023 USD ($) county	Mar. 31, 2022 USD ($) county	Mar. 31, 2021 USD ($)
Subsequent Event [Line Items]
Broadband licenses granted, number of countries | county		84	21
Payments to acquire intangible assets | $		$ 25,004	$ 26,358	$ 13,944
Subsequent Event | Lower Colorado River Authority (LCRA) | Wireless Licenses
Subsequent Event [Line Items]
Broadband licenses granted, number of countries | county	68
Broadband licenses granted, minimum number of cities | cities	30
Payments to acquire intangible assets | $	$ 30,000