Anterix (ATEX) 10-Q 8 Feb 21 2021 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Dec. 31, 2020	Jan. 31, 2021
Document And Entity Information [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Fiscal Year Focus	2021
Document Period End Date	Dec. 31, 2020
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 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 Tax Identification Number	33-0745043
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 Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		17,586,356
Amendment Flag	false
Document Fiscal Period Focus	Q3
Entity Central Index Key	0001304492

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2020	Mar. 31, 2020
Current Assets
Cash and cash equivalents	$ 108,486	$ 137,453
Accounts receivable, net of allowance for doubtful accounts of $8 and $12, respectively	19	61
Prepaid expenses and other current assets	4,527	4,638
Total current assets	113,032	142,152
Property and equipment, net	3,752	7,000
Right of use assets, net	5,404	6,500
Intangible assets	118,066	111,526
Equity method investment	16	39
Other assets	845	180
Total assets	241,115	267,397
Current liabilities
Accounts payable and accrued expenses	7,347	5,649
Due to related parties	121	110
Restructuring reserve	36	636
Operating lease liabilities	1,529	1,695
Deferred revenue	729	733
Total current liabilities	9,762	8,823
Noncurrent liabilities
Operating lease liabilities	5,928	7,051
Deferred revenue	2,186	2,733
Deferred income tax	3,395	3,084
Other liabilities	677	640
Total liabilities	21,948	22,331
Commitments and contingencies
Stockholders' equity
Preferred stock, $0.0001 par value per share, 10,000,000 shares authorized and no shares outstanding at December 31, 2020 and March 31, 2020
Common stock, $0.0001 par value per share, 100,000,000 shares authorized and 17,584,332 shares issued and outstanding at December 31, 2020 and 17,184,712 shares issued and outstanding at March 31, 2020	2	2
Additional paid-in capital	468,578	450,978
Accumulated deficit	(249,413)	(205,914)
Total stockholders' equity	219,167	245,066
Total liabilities and stockholders' equity	$ 241,115	$ 267,397

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2020	Mar. 31, 2020
Consolidated Balance Sheets [Abstract]
Allowance for doubtful accounts	$ 8	$ 12
Preferred Stock, par value	$ 0.0001	$ 0.0001
Preferred Stock, shares authorized	10,000,000	10,000,000
Preferred Stock, shares outstanding	0	0
Common Stock, par value	$ 0.0001	$ 0.0001
Common Stock, shares authorized	100,000,000	100,000,000
Common Stock, shares issued	17,584,332	17,184,712
Common Stock, shares outstanding	17,584,332	17,184,712

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Operating revenues
Operating revenues	$ 236	$ 361	$ 740	$ 1,237
Operating expenses
Direct cost of revenue (exclusive of depreciation and amortization)	543	631	1,606	2,248
General and administrative	6,300	4,740	17,620	14,145
Sales and support	612	949	1,904	2,922
Product development	1,098	610	2,595	1,846
Depreciation and amortization	1,020	1,135	3,418	2,412
Stock compensation expense	2,672	1,404	13,245	4,393
Restructuring costs	44	35	65	195
Impairment of long-lived assets	11	33	40	33
Total operating expenses	12,300	9,537	40,493	28,194
(Gain)/loss from disposal of intangible assets, net		140	3,849	140
(Gain)/loss from disposal of long-lived assets, net			(6)	62
Loss from operations	(12,064)	(9,316)	(43,596)	(27,159)
Interest income	27	517	99	1,505
Other income	110	142	332	356
(Loss)/income on equity method investment	(7)	(23)	(23)	(8)
Loss before income taxes	(11,934)	(8,680)	(43,188)	(25,306)
Income tax expense	155	131	311	594
Net loss	$ (12,089)	$ (8,811)	$ (43,499)	$ (25,900)
Net loss per common share basic and diluted	$ (0.69)	$ (0.52)	$ (2.51)	$ (1.60)
Weighted-average common shares used to compute basic and diluted net loss per share	17,492,539	17,093,133	17,350,671	16,167,845
Service [Member]
Operating revenues
Operating revenues	$ 53	$ 178	$ 193	$ 690
Spectrum [Member]
Operating revenues
Operating revenues	$ 183	$ 183	$ 547	$ 547

Consolidated Statement of Stock

Consolidated Statement of Stockholders’ Equity - USD ($) $ in Thousands		Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Total
Balance at Mar. 31, 2019		$ 1	$ 349,039	$ (168,276)	$ 180,764
Balance, Shares at Mar. 31, 2019		14,739,145
Issuance of stock during July 2019 follow-on offering, net of closing costs		$ 1	94,243		94,244
Issuance of stock during July 2019 follow-on offering, net of closing costs, Shares		2,222,223
Equity based compensation	[1]		4,393		4,393
Equity based compensation, Shares	[1]	93,956
Stock option exercises			2,220		2,220
Stock option exercises, Shares		102,323
Shares withheld for taxes			(467)		(467)
Shares withheld for taxes, Shares		(10,967)
Net loss				(25,900)	(25,900)
Balance at Dec. 31, 2019		$ 2	449,428	(194,176)	255,254
Balance, Shares at Dec. 31, 2019		17,146,680
Balance at Sep. 30, 2019		$ 2	447,845	(185,365)	262,482
Balance, Shares at Sep. 30, 2019		17,125,938
Equity based compensation	[1]		1,404		1,404
Equity based compensation, Shares	[1]	13,259
Stock option exercises			200		200
Stock option exercises, Shares		8,000
Shares withheld for taxes			(21)		(21)
Shares withheld for taxes, Shares		(517)
Net loss				(8,811)	(8,811)
Balance at Dec. 31, 2019		$ 2	449,428	(194,176)	255,254
Balance, Shares at Dec. 31, 2019		17,146,680
Balance at Mar. 31, 2020		$ 2	450,978	(205,914)	245,066
Balance, Shares at Mar. 31, 2020		17,184,712
Equity based compensation	[1]		13,245		13,245
Equity based compensation, Shares	[1]	229,347
Equity payment of prior year accrued employee related expenses			1,537		1,537
Equity payment of prior year accrued employee related expenses, Shares		28,131
Stock option exercises			2,818		2,818
Stock option exercises, Shares		142,142
Net loss				(43,499)	(43,499)
Balance at Dec. 31, 2020		$ 2	468,578	(249,413)	219,167
Balance, Shares at Dec. 31, 2020		17,584,332
Balance at Sep. 30, 2020		$ 2	464,620	(237,324)	227,298
Balance, Shares at Sep. 30, 2020		17,487,201
Equity based compensation	[1]		2,672		2,672
Equity based compensation, Shares	[1]	22,907
Equity payment of prior year accrued employee related expenses, Shares		4,199
Stock option exercises			1,286		1,286
Stock option exercises, Shares		70,025
Net loss				(12,089)	(12,089)
Balance at Dec. 31, 2020		$ 2	$ 468,578	$ (249,413)	$ 219,167
Balance, Shares at Dec. 31, 2020		17,584,332
[1]	includes restricted shares

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES
Net loss	$ (43,499)	$ (25,900)
Adjustments to reconcile net loss to net cash used by operating activities
Depreciation and amortization	3,418	2,412
Non-cash compensation expense attributable to stock awards	13,245	4,393
Deferred income taxes	311	594
Bad debt expense		45
Net loss from disposal of intangible assets	3,849
(Gain)/loss on disposal of long-lived assets, net	(6)	75
Loss on disposal of capitalized patent costs		140
Impairment of long-lived assets	40	33
Loss/(income) on equity method investment	23	8
Changes in operating assets and liabilities
Accounts receivable	42	439
Prepaid expenses and other assets	(639)	640
Right of use assets	1,102	1,063
Accounts payable and accrued expenses	3,838	(511)
Due to related parties	11	(77)
Restructuring reserve	(600)	(2,098)
Operating lease liabilities	(1,289)	(1,044)
Deferred revenue	(551)	(595)
Other liabilities	36	(72)
Net cash used by operating activities	(20,669)	(20,455)
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of intangible assets, including refundable deposits	(10,882)	(1,608)
Purchases of equipment	(234)	(413)
Net cash used by investing activities	(11,116)	(2,021)
CASH FLOWS FROM FINANCING ACTIVITIES
Net proceeds from July 2019 follow-on offering		94,244
Proceeds from stock option exercises	2,818	2,220
Payments of withholding tax on net issuance of restricted stock		(467)
Net cash provided by financing activities	2,818	95,997
Net change in cash and cash equivalents	(28,967)	73,521
CASH AND CASH EQUIVALENTS
Beginning of the period	137,453	76,722
End of the period	108,486	150,243
Cash paid during the period:
Taxes paid	36	25
Non-cash investing activity:
Capitalized change in estimated asset retirement obligations		503
Barter transaction		34
Contribution of capital equipment to TeamConnect LLC		$ 14
Network equipment provided for wireless licenses	23
Non-cash financing activities:
Equity payment of prior year accrued employee related expenses	$ 1,537

Nature of Operations

Nature of Operations	9 Months Ended
	Dec. 31, 2020
Nature of Operations [Abstract]
Nature of Operations	1. 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, technologies and solutions. 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 Federal Communications Commission (“FCC”) approved a 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”). 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, with a focus on pursuing licenses in those counties in which it believes it has near-term commercial opportunities. At the same time, the Company’s sales and marketing organization is pursuing opportunities to lease the broadband licenses 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. On August 6, 2019, the Company changed its name from pdvWireless, Inc. to Anterix Inc. The Company maintains offices in Woodland Park, New Jersey and McLean, Virginia.  In December 2020, the Company entered into its first long-term 900 MHz broadband spectrum lease agreements (the “Lease Agreements”) covering Ameren Corporation’s (“Ameren”) service territories. The Lease Agreements will enable Ameren to deploy a private LTE network in its service territories in Missouri and Illinois covering approximately 7.5 million people. Each Lease Agreement is for a term of up to 40 years, consisting of an initial term of 30 years, with an option to extend for an additional 10 -year term for an additional payment. The scheduled prepayments for the 30 -year initial terms of the Lease Agreements total approximately $48 million dollars. Full prepayment for the 30 -year initial terms is due by 2026, with approximately 50% of the total prepayments due June 2021. The timing of these payments is subject to the Company’s timely clearing of spectrum and delivery of broadband spectrum licenses. The Company is proactively clearing incumbents from the 900 MHz broadband segments in Ameren’s service territories and expects to begin delivering the broadband spectrum licenses by county in June 2021. The Company expects to recognize revenue from the Lease Agreements commencing in fiscal year 2022. Revenue will be recognized as spectrum is delivered based on straight-line amortization over the initial 30 -year terms of the Lease Agreements. The Lease Agreements are subject to customary approval terms and conditions, including the approval by both companies’ boards of directors and the Company’s ability to secure broadband licenses from the FCC.  Historical Business Operations  Historically, the Company generated revenue principally from its pdvConnect and TeamConnect businesses. pdvConnect is a mobile communication and workforce management solution. The Company historically marketed pdvConnect primarily through two Tier 1 carriers in the United States. In fiscal year 2016, it began offering a commercial push-to-talk (“PTT”) service, which was marketed as TeamConnect, in seven major metropolitan areas throughout the United States, including Atlanta, Baltimore/Washington, Chicago, Dallas, Houston, New York and Philadelphia. The TeamConnect service was primarily offered to customers indirectly through third-party sales representatives who were largely selected from Motorola’s nationwide dealer network.  In June 2018, the Company announced its plan to restructure its operations to align and focus its business priorities on its broadband spectrum initiatives. Consistent with this restructuring plan, the Company transferred its TeamConnect business in December 2018 to A BEEP LLC (“A BEEP”) and Goosetown Enterprises, Inc (“Goosetown”), with the Company continuing to provide customer care, billing and collection services through April 1, 2019. On December 31, 2018, the Company entered into a memorandum of understanding (“MOU”) with the principals of Goosetown. Under the terms of the MOU, the Company assigned the intellectual property rights to its TeamConnect and pdvConnect related applications to TeamConnect LLC (the “LLC”). The LLC assumed customer care services related to the pdvConnect service, with the Company providing transition services to the LLC through April 1, 2019. On April 1 , 2020, the Company transferred its pdvConnect customers to the LLC and the LLC agreed to pay the Company a certain portion of the recurring revenues from these customers. Follow-on Offering  In July 2019, the Company completed a registered follow-on offering in which it sold 2,222,223 shares of its common stock at a purchase price to the public of $45.00 per share. Net proceeds were approximately $94.2 million after deducting $5.5 million in underwriting discounts and commissions, and $0.3 million in offering expenses.  Executive Succession Plan  On June 25, 2020, the Company issued a press release announcing an effective date of July 1, 2020 for its executive leadership succession plan (the “ Succession Plan ”), which followed the achievement of the FCC Report and Order.  TeamConnect LLC  On August 4, 2020, we entered into Amendment 2 (“Amendment 2”) to the IP Assignment, Software Support, and Development Services Agreement, dated as of January 7, 2019, as previously amended, by and between us and TeamConnect, LLC (the “LLC”). Under Amendment 2, we agreed to transfer our pdvConnect customers to the LLC, effective as of April 1, 2020 , except for one Tier 1 domestic carrier . In exchange for the customer transfer, the LLC agreed to pay us a certain portion of the recurring revenues from these customers.

Summary of Significant Accounti

Summary of Significant Accounting Policies	9 Months Ended
	Dec. 31, 2020
Summary of Significant Accounting Policies [Abstract]
Summary of Significant Accounting Policies	2. Summary of Significant Accounting Policies  Basis of Presentation and Use of Estimates  The unaudited consolidated financial statements and accompanying notes are prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) for interim financial information. Pursuant to the rules and regulations of the U.S. Securities and Exchange Commission (the “SEC”), certain information and footnote disclosures normally included in annual consolidated financial statements prepared in accordance with U.S. GAAP have been condensed or omitted.  Because certain information and footnote disclosures have been condensed or omitted, these unaudited consolidated financial statements should be read in conjunction with the audited consolidated financial statements and related notes in the Company’s Annual Report on Form 10-K for the fiscal year ended March 31, 2020, as filed on May 28, 2020 with the SEC. In the Company’s opinion all normal and recurring adjustments considered necessary for a fair presentation of the financial position, results of operations and cash flows for the periods presented have been included. The Company believes that the disclosures made in the unaudited consolidated interim financial statements are adequate to make the information not misleading. The results of operations for the interim periods presented are not necessarily indicative of the results for the year. 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. New estimates in the period relate to determining the Company’s estimated incremental borrowing rate in recognizing right of use assets and operating lease liabilities. 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.  Reclassifications  Certain prior year amounts have been reclassified to conform to the presentation of the corresponding amounts in the financial statements for the three and nine months ended December 31, 2020. These reclassifications had no effect on previously reported net loss or net loss per common share basic and diluted.  Intangible Assets  Intangible assets are wireless licenses that will be used to provide the Company with the exclusive right to utilize designated radio frequency spectrum to provide wireless communication services. On May 13, 2020, the FCC approved 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, with a focus on pursuing licenses in those counties in which it believes it has near-term commercial opportunities. 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.  The licenses are tested for impairment annually on an aggregate basis, as the Company will be utilizing the wireless licenses on an integrated basis as part of developing broadband. In the year ended March 31, 2020, (“Fiscal 2020”), the Company performed a step zero qualitative approach 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. There are no triggering events indicating impairment in the three and nine months ended December 31, 2020.  See Note 4 “Intangible Assets” for a discussion of the Company’s (gain)/loss from the disposal of intangible assets incurred during the period ended December 31, 2020.  Long-Lived Asset and Right of Use Asset 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. During the three and nine months ended December 31, 2020, the Company recorded a $11,000 and $40,000 , respectively, a non-cash impairment charge for long-lived assets consisting of network site costs to reduce the carrying values to zero . During the nine months ended December 31, 2019, the Company recorded a $33,000 non-cash impairment charge for long-lived assets consisting of $22,000 for property and equipment and $11,000 for a right of use asset to reduce the carrying values to zero .  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, stock options, restricted stock and warrants are considered to be potentially dilutive securities. Because the Company has reported a net loss for the three and nine months ended December 31, 2020 and 2019, respectively, 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 1,402,000 and 1,396,000 at December 31, 2020 and 2019, 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  In June 2016, the FASB issued ASC 326, Financial Instruments - Credit Losses and has subsequently modified several areas of the standard in order to provide additional clarity and improvements. The new standard requires entities to use a Current Expected Credit Loss impairment model based on expected losses rather than incurred losses. Under this model, an entity would recognize an impairment allowance equal to its current estimate of all contractual cash flows that the entity does not expect to collect from financial assets measured at amortized cost within the scope of the standard. The entity's estimate would consider relevant information about past events, current conditions and reasonable and supportable forecasts, which will result in recognition of lifetime expected credit losses. As a smaller reporting company, the standard will be effective for the Company's fiscal year beginning April 2023, including interim reporting periods within that fiscal year, although early adoption is permitted. The Company is evaluating the potential impact that ASC 326 and subsequent modifications may have on its consolidated financial statements.  Other 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 are not expected to have a material impact on the Company’s consolidated financial statements upon adoption. 

Revenue

Revenue	9 Months Ended
	Dec. 31, 2020
Revenue [Abstract]
Revenue	3. Revenue  In December 201 8, the Company’s board of directors (the “Board”) approved the transfer of its TeamConnect business and 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. Specifically, the Company entered into: (i) a Customer Acquisition and Resale Agreement with A BEEP on January 2, 2019, (ii) a Customer Acquisition, Resale and Licensing Agreement with Goosetown on January 2, 2019 and (iii) a n MOU with the principals of Goosetown on December 31, 2018. Under the A BEEP and Goosetown Agreements, the Company agreed to: (i) transfer its TeamConnect customers located in the Atlanta, Chicago, Dallas, Houston and Phoenix metropolitan markets to A BEEP, (ii) transfer its TeamConnect customers located in the Baltimore/Washington DC, Philadelphia and New York metropolitan markets to Goosetown, (iii) provide A BEEP and Goosetown with access to MotoTRBO Systems and (iv) grant A BEEP and Goosetown the right to resell access to the MotoTRBO Systems pursuant to separate Mobile Virtual Network Operation arrangements for a two -year period. The Company also granted Goosetown a license to sell the business applications the Company developed for its TeamConnect service. On March 31, 2019, the agreements were amended to formally set the transition date for the businesses as April 1, 2019 and to clarify the responsibilities between the parties.  Under these agreements, A BEEP and Goosetown agreed to provide customer care, billing and collection services for their respective acquired customers. The Company continued to provide these services through April 1, 2019 to help facilitate the transitioning of the acquired customers. Additionally, the Company is required to maintain and pay all site lease, backhaul and utility costs required to operate the MotoTRBO Systems for a two -year period. As part of the Company’s efforts to clear the 900 MHz spectrum for broadband use, A BEEP and Goosetown are required to migrate the acquired customers off the MotoTRBO Systems over the two -year period. In consideration for the customers and rights the Company transferred, A BEEP and Goosetown are required to pay a certain portion of the recurring revenues they receive from the acquired customers ranging from 100% to 20% during the terms of the agreements. Additionally, A BEEP is required to pay the Company a portion of recurring revenue from customers who utilize A BEEP’s push-to-talk Diga-talk Plus application service ranging from 35% to 15% for a period of two years. For a period of two years, Goosetown is required to pay the Company 20% of recurring revenues from the TeamConnect applications it licensed.  Under the terms of the MOU that the Company entered into with the principals of Goosetown on December 31, 2018, the Company assigned the intellectual property rights to its TeamConnect and pdvConnect related applications to the LLC. The LLC also assumed customer care services related to the pdvConnect service, with the Company providing transition services to the LLC through April 1, 2019. On April 1, 2020, the Company transferred its pdvConnect customers to the LLC, and the LLC agreed to pay the Company a certain portion of the recurring revenues from these customers.  In accordance with ASC 606, when the customer purchased or received a discounted handset in connection with entering into a contract for service, the Company allocated revenue between the handset and the service based on the relative standalone selling price. Revenue was recognized when the performance obligation which includes providing the services or transferring control of promised handsets, which are distinct to a customer, had been satisfied. Revenue was recognized in an amount that reflects the consideration the Company expects to be entitled to for those performance obligations.  Long-Term Lease of 900 MHz Broadband Spectrum. In December 2020, the Company entered into its first long-term 900 MHz broadband spectrum lease agreements (the “Lease Agreements”) covering Ameren Corporation’s (“Ameren”) service territories. The Lease Agreements will enable Ameren to deploy a private LTE network in its service territories in Missouri and Illinois covering approximately 7.5 million people. Each Lease Agreement is for a term of up to 40 years, consisting of an initial term of 30 years, with an option to extend for an additional 10 -year term for an additional payment. The scheduled prepayments for the 30 -year initial terms of the Lease Agreements total approximately $48 million dollars. Full prepayment for the 30 -year initial terms is due by 2026, with approximately 50% of the total prepayments due by June 2021. The timing of these payments is subject to the Company’s clearing of spectrum and delivery of broadband spectrum licenses. The Company is proactively clearing incumbents from the 900 MHz broadband segments in Ameren’s service territories and expects to begin delivering the broadband spectrum licenses by county in June 2021. The Lease Agreements are subject to customary approval terms and conditions, including the approval by both companies’ boards of directors and the Company’s ability to secure broadband licenses from the FCC.  Assuming the conditions to the Lease Agreements are satisfied, the Company expects to recognize revenue from the Lease Agreements commencing in fiscal year 2022. The payments of prepaid fees will be accounted for as deferred revenue on the Company’s consolidated balance sheets and will be recognized ratably as the Company delivers broadband spectrum by county over the contractual term of approximately 30 -years.  Service Revenue . The Company has historically derived its service revenue from a fixed monthly recurring unit price per user, with 30 -day payment terms, for its pdvConnect and TeamConnect service offerings.  pdvConnect is a proprietary cloud-based mobile resource management solution which has historically been sold as a separate software-as-a-service offering for dispatch-centric business customers who utilize Tier 1 cellular networks, and to a lesser extent, who utilize land mobile radio networks not operated by the Company. pdvConnect was historically sold directly by the Company or through two Tier 1 domestic carriers. The service is contracted and billed on a month-to-month basis, and the Company satisfies its performance obligation over time as the services are delivered. On April 1, 2020, these customers were transferred to the LLC, except for one Tier 1 domestic carrier. The LLC agreed to pay the Company a certain portion of the recurring revenues from the transferred customers through the term of the agreement.  TeamConnect combines pdvConnect with push-to-talk (“PTT”) mobile communication services involving digital network architecture and mobile devices. The contract period for the TeamConnect service varies from a month-to-month basis to 24 months. The customer is billed at the beginning of each month of the contract term. The Company recognizes revenue as it satisfies its performance obligation over time as the services are delivered. On April 1, 2019, these customers were transitioned to A BEEP and Goosetown. A BEEP and Goosetown agreed to pay the Company a certain portion of the recurring revenues during the term of the agreements. While the customer remains on the Company’s MotoTRBO Systems, the portion of recurring revenues paid by A BEEP and Goosetown is recorded as revenue.  Spectrum Revenue. In September 201 4, Motorola paid the Company an upfront, fully-paid fee of $7.5 million in order to use a portion of the Company’s wireless 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. The revenue recognized for the three and nine months ended December 31 , 2020 and 2019 w ere approximately $183,000 and $547,000 , respectively for each period .  Contract Assets. The Company recognizes a contract asset for the incremental costs of obtaining a contract with a customer. These costs include sales commissions. These costs will be 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. If it is determined that there is an impairment, the contract asset will be expensed.  As of December 31, 2020, the Company incurred commission costs required to obtain the Ameren lease agreements amounting to approximately $126,000 which will be amortized over the contractual term of approximately 30 -years.  Historically, these costs include commissions for salespeople and commissions paid to third-party dealers. As a result of transferring customers to A BEEP and Goosetown, all contract and contract acquisition costs were impaired for the nine months ended December 31, 2019 . The Company increased direct cost of revenue amounting to $178,000 and sales and support expense amounting to $258,000 for the nine months ended December 31 , 20 19 .  The following table presents the activity for the Company’s contract assets (in thousands):     Contract Assets  Balance at March 31, 2020 $ —  Additions 126  Amortization —  Impairment —  Balance at December 31, 2020 126  Less amount classified as current assets - included in prepaid expenses and other current assets (4)  Noncurrent assets - included in other assets $ 122  Contract liabilities. 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. The related liability as of March 31, 2020 of $3.5 million has been reduced by revenue recognized in the nine months ended December 31, 2020 of $0.6 million leaving a remaining liability of $2.9 million as of December 31, 2020.

Intangible Assets

Intangible Assets	9 Months Ended
	Dec. 31, 2020
Intangible Assets [Abstract]
Intangible Assets	4. 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 three and nine months ended December 31 , 2020 and 2019.  During the nine months ended December 31 , 2020, the Company entered into agreements with several third parties in multiple U.S. markets to acquire wireless licenses for cash consideration of $11.6 million after receiving FCC approval.  The nation’s railroads, particularly the major freight lines, operate on six narrowband 900 MHz channels licensed to their trade association, 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 in which it 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 FCC referenced the AAR agreement in the Report and Order and required the Company to cancel its licenses and return them to the FCC in accordance with 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, the Company cancelled its licenses in the three months ended June 30, 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 in the Consolidated Statements of Operations for the three months ended June 30, 2020.  In August 2020, the Company closed an agreement with a third party for the exchange of 900 MHz licenses plus approximately $0.3 million for the reprogramming of their equipment. Since the licenses the Company acquired in the exchange were included in the licenses returned to the FCC in accordance with the AAR Agreement above, the $0.3 million for equipment reprogramming was recorded as additional loss from disposal of the intangible assets in the Consolidated Statements of Operations for the nine months ended December 31 , 2020 .  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 in Fiscal 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 in the Consolidated Statement of Operations when the deal closed in September 2020 .  Intangible assets consist of the following at December 31 , 2020 and March 31, 2020 (in thousands):    Wireless Licenses  Balance at March 31, 2020 $ 111,526  Acquisitions 11,589  Exchanges - licenses received 196  Exchanges - licenses surrendered (262)  Cancellations (4,983)  Balance at December 31, 2020 $ 118,066

Equity Method Investment

Equity Method Investment	9 Months Ended
	Dec. 31, 2020
Equity Method Investment [Abstract]
Equity Method Investment	5. Equity Method Investment  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 the 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. The Goosetown principals have agreed to fund the future operations of the LLC, subject to certain limitations. The LLC has assumed the Company’s software support and maintenance obligations under the Goosetown and A BEEP Agreements. The LLC has also assumed customer care services related to the Company’s pdvConnect application. The Company provided transition services to the LLC through April 1, 2019 to facilitate an orderly transition of the customer care services . On April 1, 2020, the Company transferred its pdvConnect customers to the LLC, and the LLC agreed to pay the Company a certain portion of the recurring revenues from these customers. During the nine months ended December 31, 2020 , the change in the carrying value of the investment in the LLC is summarized as follows (in thousands):    Equity Method Investment  Equity method investment carrying value at March 31, 2020 $ 39  Share of net loss from LLC (23)  Equity method investment carrying value at December 31, 2020 $ 16

Related Party Transactions

Related Party Transactions	9 Months Ended
	Dec. 31, 2020
Related Party Transactions [Abstract]
Related Party Transactions	6. Related Party Transactions  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. For the three and nine months ended December 31, 2020, the Company incurred payments of $176,000 and $529,000 under the MOU, respectively. For the three and nine months ended December 31, 2019, the Company incurred payments of $215,000 and $729,000 under the MOU, respectively. As of December 31, 2020 and March 31, 2020, the Company owed $1,000 and $12,000 to the LLC, respectively.  The Company did no t purchase any equipment from Motorola for the three and nine months ended December 31, 2020. The Company purchased $11,000 of equipment from Motorola for the nine months ended December 31, 2019. The Motorola revenue recognized for the three and nine months ended December 31, 2020 and, 2019 were approximately $183,000 and $547,000 , respectively for each period. As of December 31, 2020 and March 31, 2020, the Company owed $120,000 and $98,000 to Motorola, respectively.  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 Company’s Board of Directors and as a member of the Board’s Nominating and Corporate Governance Committee. During the three and nine months ended December 31, 2020, the Company incurred $36,000 and $96,000 , respectively, in consulting fees to Ms. Chong. As of December 31, 2020, the Company did no t have any outstanding liabilities to Ms. Chong.  On June 25, 2020, as part of its Executive 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 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. The Consulting Agreement provides that Mr. McAuley will receive cash compensation of $40,000 per year. Pursuant to the existing terms of his outstanding equity awards, Mr. McAuley will continue to vest in his outstanding equity awards as he continues to provide services to the Company pursuant to the Consulting Agreement. The Consulting Agreement is effective as of September 2, 2020 and terminates by its terms on September 1, 2021, unless terminated earlier by either party or extended upon the mutual agreement of the parties at least thirty (30) days before the end of the term. The Consulting Agreement contains standard confidentiality, indemnification and intellectual property assignment provisions in favor of the Company. The Consulting Agreement also contains a waiver by Mr. McAuley to any severance benefits that he might be entitled to receive under the Company’s Executive Severance Plan in connection with his resignation and the Executive Succession Plan. In consideration for this wavier, in the event the Company terminates the Consulting Agreement without cause, Mr. McAuley dies or becomes disabled during the term of the Consulting Agreement, or the Company elects not to extend the term of the Consulting Agreement through September 1, 2023, then the vesting of all outstanding time-based equity awards held by Mr. McAuley shall accelerate on the date his consulting services end such that he will be deemed to have vested in a total of 18,761 shares of Common Stock for his services under the Consulting Agreement. In addition, Mr. McAuley’s performance-based equity awards shall remain outstanding (and shall not terminate) and he shall continue to be eligible to obtain vested option shares and vested restricted stock units under his outstanding performance-based equity awards if the “Vesting Conditions” set forth in the performance-based equity awards are satisfied.

Impairment and Restructuring Ch

Impairment and Restructuring Charges	9 Months Ended
	Dec. 31, 2020
Impairment and Restructuring Charges [Abstract]
Impairment and Restructuring Charges	7. Impairment and Restructuring Charges  Long-lived Assets and Right of Use Assets Impairment.  During the three and nine months ended December 31, 2020, the Company recorded a $11,000 and $40,000 non-cash impairment charge for long-lived assets, respectively, consisting for network site costs to reduce the carrying values to zero .  During the three and nine months ended December 31, 2019, the Company recorded a $33,000 non-cash impairment charge for long-lived assets consisting of $22,000 for property and equipment and $11,000 for a right of use asset to reduce the carrying values to zero .  Restructuring Charges.  April 2018 and June 2018 restructuring activities . In April 2018, the Company announced a shift in its focus and resources in order to pursue its regulatory initiatives at the FCC and prepare for the future deployment of broadband and other advanced technologies and services. In light of this shift in focus, the Company’s Board also approved a chief executive officer transition plan, under which, John Pescatore, the Company’s chief executive officer and president, transitioned to the position of vice chairman and Morgan O’Brien, the Company’s then-current vice chairman, assumed the position as the new chief executive officer. In connection with the transition, the Company and Mr. Pescatore entered into a Continued Service, Consulting and Transition Agreement and a separate Consulting Agreement (the “CEO Transition Agreements”) and the Company also entered into additional consulting and transition agreements with several other key employees.  On June 1, 2018, the Company’s Board approved an initial plan to restructure its business aimed at reducing the operating costs of its TeamConnect and pdvConnect businesses and better aligning and focusing its business priorities on its spectrum initiatives. As part of the restructuring plan, the Company eliminated approximately 20 positions, or 20% of its workforce, primarily from its TeamConnect and pdvConnect businesses. In August 2018, the Company continued with its restructuring efforts and eliminated approximately seven additional positions.  For the nine months ended December 31, 2020 , total accrued restructuring charges for the April 2018 and June 2018 restructuring activities were as follows (in thousands):    Restructuring Activities  Balance at March 31, 2020 $ 565  Cash payments (565)  Balance at December 31, 2020 $ —   December 2018 cost reductions. On December 31, 2018, the Company’s board of directors approved the following cost reduction actions: (i) the elimination of approximately 20 positions, or 30% of the Company’s workforce and (ii) the closure of its office in San Diego, California (collectively, the “December 2018 Cost-Reduction Actions”). For the three and nine months ended December 31, 2020, the Company recorded restructuring charges relating to the December 2018 Cost-Reduction Actions in the amounts of $45,000 and $42,000 , respectively , related to employee severance and benefit costs. For the three and nine months ended December 31 , 2019, the Company recorded an additional restructuring charge relating to the December 2018 Cost-Reduction Actions amounting to $34,000 and $206,000 , respectively, related to employee severance and benefit costs. For the nine months ended December 31 , 2019, the Company reduced the facility exit costs accrual for our San Diego, California office by approximately $28,000 . The Company completed the cost reduction and restructuring actions in July 31, 2019 and the related cash payments for severance costs was completed by the end of August 31, 2019. Final payment of approximately $36,000 is expected to be made by January 31, 2021.  For the nine months ended December 31, 2020, total December 2018 cost reduction charges were as follows (in thousands):    Restructuring Activities  Balance at March 31, 2020 $ 71  Severance costs 42  Cash payments (77)  Balance at December 31, 2020 $ 36  

Leases

Leases	9 Months Ended
	Dec. 31, 2020
Leases [Abstract]
Leases	8. 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 of 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, 2024 through June 30, 2027, which includes a ten -year lease extension for its corporate headquarters. The Company entered into multiple lease agreements for tower space related to its TeamConnect business. The lease expiration dates range from January 31, 2021 to June 30, 2026.  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 Topic 842, operating lease agreements are required to be recognized on the Consolidated Balance Sheet as Right of Use (“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:    Nine months ended December 31,  2020 2019  Weighted average term - operating lease liabilities 4.51 years 5.19 years  Weighted average incremental borrowing rate - operating lease liabilities 13% 13%   Rent expense amounted to approximately $0.7 million for the three months ended December 31, 2020 and December 31, 2019 , of which approximately $0.4 million was classified as cost of revenue and the remainder of approximately $0.3 million was classified in operating expenses in the Consolidated Statements of Operations , respectively . Rent expense amounted to approximately $2.0 million for the nine months ended December 31, 2020 and December 31, 2019 , of which approximately $1.2 million was classified as cost of revenue and the remainder of approximately $0.8 million was classified in operating expenses in the Consolidated Statements of Operations , respectively .  In June 2020, the Company terminated an operating tower space lease early resulting in a non-cash reductions in ROU assets by $19,000 , operating lease liabilities by $20,000 and gain in disposal of long-lived asset by $1,000 .  The following table presents net lease cost for the three and nine months ended December 31, 2020 and 2019 (in thousands):    Three months ended December 31, Nine months ended December 31,  2020 2019 2020 2019  Lease cost  Operating lease cost (cost resulting from lease payments) $ 619 $ 662 $ 1,890 $ 1,952  Short term lease cost 50 10 93 42  Sublease income — (4) (6) (13)  Net lease cost $ 669 $ 668 $ 1,977 $ 1,981  The following table presents supplemental cash flow and non-cash activity information for the nine months ended December 31, 2020 and 2019 (in thousands):    Nine months ended December 31,  2020 2019  Operating cash flow information:  Operating lease - operating cash flows (fixed payments) $ 2,096 $ 2,012  Operating lease - operating cash flows (liability reduction) $ 1,289 $ 1,044  Non-cash activity:  Right of use assets obtained in exchange for new operating lease liabilities $ 77 $ 7,904  The following table presents supplemental balance sheet information as of December 31, 2020 and March 31, 2020 (in thousands):    December 31, 2020 March 31, 2020  Non-current assets - right of use assets, net $ 5,404 $ 6,500  Current liabilities - operating lease liabilities $ 1,529 $ 1,695  Non-current liabilities - operating lease liabilities $ 5,928 $ 7,051  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 nine months ended December 31, 2020 are as follows (in thousands):    Operating  Fiscal Year Leases  2021 (excluding the nine months ended December 31, 2020) $ 637  2022 2,297  2023 2,132  2024 1,930  2025 1,524  After 2025 1,373  Total future minimum lease payments 9,893  Amount representing interest (2,436)  Present value of net future minimum lease payments $ 7,457

Income Taxes

Income Taxes	9 Months Ended
	Dec. 31, 2020
Income Taxes [Abstract]
Income Taxes	9. Income Taxes  On March 27, 2020, the Coronavirus Aid Relief and Economic Security (“CARES”) Act was signed into law. The Act contains several new or changed income tax provisions, including but not limited to the following: increased limitation threshold for determining deductible interest expense, class life changes to qualified improvements (in general, from 39 years to 15 years) and the ability to carry back net operating losses (“NOLs”) incurred from tax years 2018 through 2020 up to the five preceding tax years. Most of these provisions are either not applicable or have no material effect on the Company. However, the CARES Act changed the language of when NOLs converted from a 20-year life to an indefinite life. From the Tax Cuts and Jobs Act of 2017 (“TCJA”) rule, NOLs in tax periods ending after December 31, 2017 had an indefinite life. Under the new CARES Act, NOLs generated in periods beginning after December 31, 2017 are carried forward indefinitely. This dating change effectively disqualified the Company's March 31, 2018 NOL as an indefinite lived asset and source of taxable income to offset the Company's deferred tax liability stemming from indefinite-lived intangibles. The Company's NOLs generated after March 31, 2018, may continue to be used as an indefinite-lived asset to offset the deferred tax liability, but limited to 80% of future taxable income (or the balance of the deferred tax liability as of March 31, 2020). The total impact of this date change from the CARES Act increased the Company's net federal deferred tax liability from approximately $0.2 million to $1.6 million as of March 31, 2020. The state deferred tax liability of approximately $1.4 million as of March 31, 2020 is unchanged.  For the year ended March 31, 2020, the Company had federal and state NOL carryforwards of approximately $211.9 million and $112.7 million, respectively. Of these federal and state NOLs, approximately $125.3 million and $92.6 million, respectively, are expiring in various amounts from 2020 through 2040 , to offset future taxable income. The remaining federal and state NOLs of approximately $86.6 million and $20.1 million, respectively, have an indefinite life and the federal NOLs may only offset 80% of taxable income when used. For the nine months ended December 31 , 2020, the Company incurred federal and state net operating losses of approximately $33.5 million and $27.0 million, respectively, to offset future taxable income, of which $42.8 million can be carried forward indefinitely, but can only offset 80% of taxable income when used.  The Company used a discrete effective tax rate method to calculate taxes for the three and nine months ended December 31 , 2020. The Company determined that applying an estimate of the annual effective tax rate would not provide a reasonable estimate as small changes in estimated “ordinary” loss would result in significant changes in the estimated annual effective tax rate. Accordingly, for the three and nine months ended December 31 , 2020, the Company recorded a total deferred tax expense of $155,000 and $311,000 , respectively, due to the inability to use some portion of federal and state NOL carryforwards against the deferred tax liability created by amortization of indefinite-lived intangibles.

Stock Acquisition Rights, Stock

Stock Acquisition Rights, Stock Options and Warrants	9 Months Ended
	Dec. 31, 2020
Stock Acquisition Rights, Stock Options and Warrants [Abstract]
Stock Acquisition Rights, Stock Options and Warrants	10. 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 Company’s Board has reserved 4,147,985 shares of common stock for issuance under its 2014 Stock Plan as of December 31 , 2020, of which 833,413 sh ares are available for future issuance. The number of shares may increase, upon Board approval, each January 1 through January 1, 2024 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. 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.  Restricted Stock and Restricted Stock Units  A summary of non-vested restricted stock activity for the nine months ended December 31, 2020 is as follows:     Weighted  Average  Restricted Grant Day  Stock Fair Value  Non-vested restricted stock outstanding at March 31, 2020 352,194 $ 37.93  Granted 286,155 47.10  Forfeited (7,350) 36.75  Vested (165,494) 40.15  Non-vested restricted stock outstanding at December 31, 2020 465,505 $ 42.80  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 $2.3 million and $7.2 million for the three and nine months ended December 31 , 2020 , respectively , 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 . Stock compensation expense r elated to restricted stock was approximately $1.1 million and $3.1 million for the three and nine months ended December 31 , 2019 , respectively.  At December 31, 2020, there was $14.4 million of unvested compensation expense for restricted stock, which is expected to be recognized over a weighted average period of 2.5 years .  Performance Stock Units  A summary of the performance stock unit activity for the nine months ended December 31, 2020 is as follows:     Weighted  Average  Performance Grant Day  Stock Fair Value  Performance stock outstanding at March 31, 2020 138,984 $ 46.85  Granted 60,098 43.76  Forfeited/cancelled (77,817) 48.04  Vested (91,216) 46.85  Performance stock outstanding at December 31, 2020 30,049 $ 37.60  Outstanding performance stock units included in the table above are shown at target. Share payout can range from 0% to 200% CEO Performance Units based on the Cumulative Spectrum Proceeds Monetized (“CSPM”) metric .  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 Company’s 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 31, 2020, not all of these conditions had been achieved by December 30, 2020, and therefore, the applicable 50% of the performance shares expired unvested.  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 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 Company’s 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. The goal was achieved when the Report and Order was effective in August 2020.  On September 30, 2020, the Company recorded stock compensation expense amounting to approximately $4.3 million based on the achievement of the Target Goal or approximately 91,216 shares under the performance-based restricted stock units, upon the Report and Order becoming effective in August 2020. For the three and nine months ended December 31 , 20 20 , there was no stock compensation expense recognized for the Stretch Goal under the performance-based restricted stock units as the 47,768 performance-based restricted stock units expired as unvested .  CEO Performance Units  On December 31, 2020, the Compensation Committee awarded performance-based restricted units to the President and Chief Executive Officer as part of the Succession Plan, (the “CEO Performance Units”). The performance-based restricted units will vest based on Cumulative Spectrum Proceeds Monetized (“CSPM”) metric over a four-year measurement period commencing on June 24, 2020, with 30,049 units vesting if the target CSPM metric is achieved and up to 60,098 vesting if the maximum CSPM metric is achieved. In connection with awarding the CEO Performance Units, the Compensation Committee rescinded the previously reported June 2020 award for up to 60,098 performance-based restricted units.  For the three and nine months ended December 31, 2020, the Company recorded $1,000 and reversed approximately net $65,000 of stock compensation expense relating to the CEO Performance Units, respectively. As of December 31 , 2020, there was approximately $1.1 million of unvested compensation expense for the outstanding performance-based restricted stock units related to the December 31, 2020 CEO Performance Units.  Stock Options  A summary of stock option activity for the nine months ended December 31, 2020 is as follows:     Options Weighted Average Exercise Price  Options outstanding at March 31, 2020 1,807,466 $ 23.93  Options granted 123,058 42.04  Options exercised (154,729) (22.78)  Options forfeited/expired (2,500) (20.00)  Options outstanding at December 31, 2020 1,773,295 $ 25.30  On June 24, 2020 , the Company awarded a stock option to purchase 60,558 shares of common stock to its newly appointed President and Chief Executive Officer as part of the Succession Plan. The award has a contractual life of 10 years . 25% of the option shares will vest on July 1, 2021 with the remaining shares vesting in three equal annual installments, based on the President and Chief Executive Officer’s continuous service to the Company through the applicable vesting dates.  On October 22, 2020, the Company awarded a Senior Executive Officer a stock option to purchase 62,500 shares of common stock. The award has a contractual life of 10 years. 25% of the option shares will vest on November 15, 2021 with the remaining shares vesting in three equal annual installments, based on continuous service to the Company through the applicable vesting dates.  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 during the nine months ended December 31, 2020 were: the expected life of the award was 6.07 years; the risk-free interest rate were 0.43% to 0.51% ; the expected volatility rate were 53.41% to 52.43% ; the expected dividend yield was 0.0% ; and the expected forfeiture rate were 0% to 2% .  Stock compensation expense related to the amortization of the fair value of stock options issued was approximately $0.4 million and $0.9 million for the three and nine months ended December 31 , 2020. For the three and nine months ended December 31, 2019, stock compensation expense was approximately $0.3 million and $1.3 million, respectively .  As of December 31, 2020, there was approximately $2.2 million of unrecognized compensation expense 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 1.5 years.  Performance Stock Options    Performance Options Weighted Average Exercise Price  Performance Options outstanding at March 31, 2020 82,197 $ 46.85  Performance Options granted — —  Performance Options exercised — —  Performance Options forfeited/expired (33,780) 46.85  Performance Options outstanding at December 31, 2020 48,417 $ 46.85  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 Company’s 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 of Director approval(s) or such approval(s) has/have been received. As of December 30, 2020, not all of these conditions ha d been achieved , and therefore, the 33,780 performance -based stock option shares expire d 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 Company’s 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. The goal was achieved when the Report and Order was effective in August 2020.  For the nine months ended December 31 , 2020, the Company recognized $0.8 million based on the achievement of the Target Goal under the performance-based stock options, upon the Report and Order becoming effective in August 2020. As of December 31 , 2020, there were no unvested compensation expense relating to the outstanding performance-based stock options.  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 this subsidiary. Motorola has the right at any time to convert its 500,000 Class B Units into 500,000 shares of the Company’s common stock. The Company also has the right to force Motorola’s conversion of these Class B Units into shares of its common stock at its election. Motorola is not entitled to any assets, profits or distributions from the operations of the subsidiary. In addition, Motorola’s conversion ratio from Class B Units to shares of the Company’s common stock is fixed on a one -for-one basis, and is not dependent on the performance or valuation of either the Company or the subsidiary. The Class B Units have no redemption or call provisions and can only be converted into shares of the Company’s common stock. Management has determined that this investment does not meet the criteria for temporary equity or non-controlling interest due to the limited rights that Motorola has as a holder of Class B Units, and accordingly has presented this investment as part of its permanent equity within Additional Paid-in Capital in the accompanying consolidated financial statements.

Contingencies

Contingencies	9 Months Ended
	Dec. 31, 2020
Contingencies [Abstract]
Contingencies	11. Contingencies  Liti gation  From time to time, the Company may be involved in litigation that arises from the ordinary operations of the business, such as contractual or employment disputes or other general actions. The Company is not involved in any material legal proceedings at this time.  COVID-19 Pandemic  In March 2020, the World Health Organization declared the outbreak of a novel coronavirus (“COVID-19”) as a pandemic and COVID-19 continues to cause significant disruptions throughout the United States. The ultimate extent of the impact of COVID-19 on the financial performance of the Company and its ability to secure broadband licenses pursuant to the terms of the 900 MHz Report and Order and to commercialize any broadband licenses it secures, will depend on future developments, including the duration and spread of COVID-19, the laws, orders and restrictions imposed by federal, state and local governmental agencies, the impact of COVID-19 on the Company’s targeted utility and critical infrastructure customers, and the overall economy, all of which are highly uncertain and cannot be predicted. If the financial markets and/or the overall economy are impacted for an extended period, the Company's operating results may be materially and adversely affected. The Company is actively managing the business to maintain its cash flow and believes that it has adequate liquidity through at least the next twelve months.

Concentrations of Credit Risk

Concentrations of Credit Risk	9 Months Ended
	Dec. 31, 2020
Concentrations of Credit Risk [Abstract]
Concentrations of Credit Risk	12. Concentrations of Credit Risk  Financial instruments that potentially expose the Company to concentrations of credit risk consist primarily of cash and cash equivalents and trade accounts receivable.  The Company places its cash and temporary cash investments with financial institutions for which credit loss is not anticipated.  As of December 31, 2020 , the Company sells its pdvConnect product and extends credit predominately to one Tier 1 domestic carrier . The Company maintains allowances for doubtful accounts based on factors surrounding the write-off history, historical trends, and other information.

Business Concentrations

Business Concentrations	9 Months Ended
	Dec. 31, 2020
Business Concentrations [Abstract]
Business Concentrations	13. Business Concentrations  For the three and nine months ended December 31 , 2020, the Company had one Tier 1 domestic carrier and one reseller that accounted for approximately 20% and 21% of total operating revenues, respectively. For the three and nine months ended December 31, 2019, the Company had one domestic carrier and one reseller that accounted for approximately 23% of operating revenues, respectively.  As of December 31 , 2020, the Company had one Tier 1 domestic carrier and one reseller that accounted for approximately 89% of total accounts receivable. As of March 31, 2020, the Company had one domestic carrier and one reseller that accounted for approximately 71% of total accounts receivable . 

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Dec. 31, 2020
Summary of Significant Accounting Policies [Abstract]
Basis of Presentation and Use of Estimates	Basis of Presentation and Use of Estimates  The unaudited consolidated financial statements and accompanying notes are prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) for interim financial information. Pursuant to the rules and regulations of the U.S. Securities and Exchange Commission (the “SEC”), certain information and footnote disclosures normally included in annual consolidated financial statements prepared in accordance with U.S. GAAP have been condensed or omitted.  Because certain information and footnote disclosures have been condensed or omitted, these unaudited consolidated financial statements should be read in conjunction with the audited consolidated financial statements and related notes in the Company’s Annual Report on Form 10-K for the fiscal year ended March 31, 2020, as filed on May 28, 2020 with the SEC. In the Company’s opinion all normal and recurring adjustments considered necessary for a fair presentation of the financial position, results of operations and cash flows for the periods presented have been included. The Company believes that the disclosures made in the unaudited consolidated interim financial statements are adequate to make the information not misleading. The results of operations for the interim periods presented are not necessarily indicative of the results for the year. 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. New estimates in the period relate to determining the Company’s estimated incremental borrowing rate in recognizing right of use assets and operating lease liabilities. 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. 
Reclassifications	 Reclassifications  Certain prior year amounts have been reclassified to conform to the presentation of the corresponding amounts in the financial statements for the three and nine months ended December 31, 2020. These reclassifications had no effect on previously reported net loss or net loss per common share basic and diluted. 
Intangible Assets	 Intangible Assets  Intangible assets are wireless licenses that will be used to provide the Company with the exclusive right to utilize designated radio frequency spectrum to provide wireless communication services. On May 13, 2020, the FCC approved 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, with a focus on pursuing licenses in those counties in which it believes it has near-term commercial opportunities. 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.  The licenses are tested for impairment annually on an aggregate basis, as the Company will be utilizing the wireless licenses on an integrated basis as part of developing broadband. In the year ended March 31, 2020, (“Fiscal 2020”), the Company performed a step zero qualitative approach 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. There are no triggering events indicating impairment in the three and nine months ended December 31, 2020.  See Note 4 “Intangible Assets” for a discussion of the Company’s (gain)/loss from the disposal of intangible assets incurred during the period ended December 31, 2020. 
Long-Lived Asset and Right of Use Asset Impairment	Long-Lived Asset and Right of Use Asset 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. During the three and nine months ended December 31, 2020, the Company recorded a $11,000 and $40,000 , respectively, a non-cash impairment charge for long-lived assets consisting of network site costs to reduce the carrying values to zero . During the nine months ended December 31, 2019, the Company recorded a $33,000 non-cash impairment charge for long-lived assets consisting of $22,000 for property and equipment and $11,000 for a right of use asset to reduce the carrying values to zero .
Net Loss Per Share of Common Stock	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, stock options, restricted stock and warrants are considered to be potentially dilutive securities. Because the Company has reported a net loss for the three and nine months ended December 31, 2020 and 2019, respectively, 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 1,402,000 and 1,396,000 at December 31, 2020 and 2019, 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	Recently Issued Accounting Pronouncements  In June 2016, the FASB issued ASC 326, Financial Instruments - Credit Losses and has subsequently modified several areas of the standard in order to provide additional clarity and improvements. The new standard requires entities to use a Current Expected Credit Loss impairment model based on expected losses rather than incurred losses. Under this model, an entity would recognize an impairment allowance equal to its current estimate of all contractual cash flows that the entity does not expect to collect from financial assets measured at amortized cost within the scope of the standard. The entity's estimate would consider relevant information about past events, current conditions and reasonable and supportable forecasts, which will result in recognition of lifetime expected credit losses. As a smaller reporting company, the standard will be effective for the Company's fiscal year beginning April 2023, including interim reporting periods within that fiscal year, although early adoption is permitted. The Company is evaluating the potential impact that ASC 326 and subsequent modifications may have on its consolidated financial statements.  Other 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 are not expected to have a material impact on the Company’s consolidated financial statements upon adoption.

Revenue (Tables)

Revenue (Tables)	9 Months Ended
	Dec. 31, 2020
Revenue [Abstract]
Schedule of Contract Assets	  Contract Assets  Balance at March 31, 2020 $ —  Additions 126  Amortization —  Impairment —  Balance at December 31, 2020 126  Less amount classified as current assets - included in prepaid expenses and other current assets (4)  Noncurrent assets - included in other assets $ 122  

Intangible Assets (Tables)

Intangible Assets (Tables)	9 Months Ended
	Dec. 31, 2020
Intangible Assets [Abstract]
Schedule of Indefinite-Lived Intangible Assets	  Wireless Licenses  Balance at March 31, 2020 $ 111,526  Acquisitions 11,589  Exchanges - licenses received 196  Exchanges - licenses surrendered (262)  Cancellations (4,983)  Balance at December 31, 2020 $ 118,066 

Equity Method Investment (Table

Equity Method Investment (Tables)	9 Months Ended
	Dec. 31, 2020
Equity Method Investment [Abstract]
Equity Method Investment	  Equity Method Investment  Equity method investment carrying value at March 31, 2020 $ 39  Share of net loss from LLC (23)  Equity method investment carrying value at December 31, 2020 $ 16 

Impairment and Restructuring _2

Impairment and Restructuring Charges (Tables)	9 Months Ended
	Dec. 31, 2020
April 2018 And June 2018 Restructuring Activities [Member]
Restructuring Cost and Reserve [Line Items]
Schedule of Accrued Restructuring Charges	  Restructuring Activities  Balance at March 31, 2020 $ 565  Cash payments (565)  Balance at December 31, 2020 $ —  
December 2018 Cost Reductions [Member]
Restructuring Cost and Reserve [Line Items]
Schedule of Accrued Restructuring Charges	  Restructuring Activities  Balance at March 31, 2020 $ 71  Severance costs 42  Cash payments (77)  Balance at December 31, 2020 $ 36  

Leases (Tables)

Leases (Tables)	9 Months Ended
	Dec. 31, 2020
Leases [Abstract]
Additional Lease Cost Information	  Nine months ended December 31,  2020 2019  Weighted average term - operating lease liabilities 4.51 years 5.19 years  Weighted average incremental borrowing rate - operating lease liabilities 13% 13%  
Lease Cost	  Three months ended December 31, Nine months ended December 31,  2020 2019 2020 2019  Lease cost  Operating lease cost (cost resulting from lease payments) $ 619 $ 662 $ 1,890 $ 1,952  Short term lease cost 50 10 93 42  Sublease income — (4) (6) (13)  Net lease cost $ 669 $ 668 $ 1,977 $ 1,981 
Supplemental Lease Information	The following table presents supplemental cash flow and non-cash activity information for the nine months ended December 31, 2020 and 2019 (in thousands):    Nine months ended December 31,  2020 2019  Operating cash flow information:  Operating lease - operating cash flows (fixed payments) $ 2,096 $ 2,012  Operating lease - operating cash flows (liability reduction) $ 1,289 $ 1,044  Non-cash activity:  Right of use assets obtained in exchange for new operating lease liabilities $ 77 $ 7,904  The following table presents supplemental balance sheet information as of December 31, 2020 and March 31, 2020 (in thousands):    December 31, 2020 March 31, 2020  Non-current assets - right of use assets, net $ 5,404 $ 6,500  Current liabilities - operating lease liabilities $ 1,529 $ 1,695  Non-current liabilities - operating lease liabilities $ 5,928 $ 7,051  
Future Minimum Payments	  Operating  Fiscal Year Leases  2021 (excluding the nine months ended December 31, 2020) $ 637  2022 2,297  2023 2,132  2024 1,930  2025 1,524  After 2025 1,373  Total future minimum lease payments 9,893  Amount representing interest (2,436)  Present value of net future minimum lease payments $ 7,457 

Stock Acquisition Rights, Sto_2

Stock Acquisition Rights, Stock Options and Warrants (Tables)	9 Months Ended
	Dec. 31, 2020
Stock Acquisition Rights, Stock Options and Warrants [Abstract]
Summary of Restricted Stock and Restricted Stock Units Activity	   Weighted  Average  Restricted Grant Day  Stock Fair Value  Non-vested restricted stock outstanding at March 31, 2020 352,194 $ 37.93  Granted 286,155 47.10  Forfeited (7,350) 36.75  Vested (165,494) 40.15  Non-vested restricted stock outstanding at December 31, 2020 465,505 $ 42.80 
Summary of Performance Stock Activity	   Weighted  Average  Performance Grant Day  Stock Fair Value  Performance stock outstanding at March 31, 2020 138,984 $ 46.85  Granted 60,098 43.76  Forfeited/cancelled (77,817) 48.04  Vested (91,216) 46.85  Performance stock outstanding at December 31, 2020 30,049 $ 37.60 
Summary of Stock Option Activity	   Options Weighted Average Exercise Price  Options outstanding at March 31, 2020 1,807,466 $ 23.93  Options granted 123,058 42.04  Options exercised (154,729) (22.78)  Options forfeited/expired (2,500) (20.00)  Options outstanding at December 31, 2020 1,773,295 $ 25.30 
Summary of Performance Stock Options	   Performance Options Weighted Average Exercise Price  Performance Options outstanding at March 31, 2020 82,197 $ 46.85  Performance Options granted — —  Performance Options exercised — —  Performance Options forfeited/expired (33,780) 46.85  Performance Options outstanding at December 31, 2020 48,417 $ 46.85  

Nature of Operations (Details)

Nature of Operations (Details) $ / shares in Units, $ in Thousands	1 Months Ended	9 Months Ended
	Jul. 31, 2019USD ($)$ / sharesshares	Dec. 31, 2020USD ($)item	Dec. 31, 2019USD ($)	Sep. 15, 2014$ / shares
Conversion of Stock [Line Items]
Lease term		30 years
Lease extension		10 years
Sale of stock | shares	2,222,223
Sale of stock, price per share | $ / shares	$ 45
Issuance of stock during July 2019 follow-on offering, net of closing costs	$ 94,200		$ 94,244
Underwriting discounts	5,500
Offering expenses	$ 300
Net proceeds from July 2019 follow-on offering			$ 94,244
TeamConnect LLC [Member]
Conversion of Stock [Line Items]
Metropolitan market areas | item		7
PDV Spectrum Holding Company, LLC [Member] | Common Class B Units [Member]
Conversion of Stock [Line Items]
Sale of stock, price per share | $ / shares				$ 20
Ameren [Member]
Conversion of Stock [Line Items]
Number of people | item		7,500,000
Lease term		30 years
Lease extension		10 years
Scheduled prepayments		$ 48,000
Percentage of prepayments		50.00%
Maximum [Member] | Ameren [Member]
Conversion of Stock [Line Items]
Lease term		40 years

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Details) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Mar. 31, 2020
Summary Of Significant Accounting Policies [Line Items]
Impairment of long-lived assets	$ 11,000	$ 33,000	$ 40,000	$ 33,000
Property and equipment, net	$ 3,752,000		$ 3,752,000		$ 7,000,000
Wireless licenses term			10 years
Lease term	30 years		30 years
Potentially dilutive securities outstanding but excluded from computation of earnings per share			1,402,000	1,396,000
Property, Plant and Equipment [Member]
Summary Of Significant Accounting Policies [Line Items]
Impairment of long-lived assets	$ 11,000		$ 40,000	$ 22,000
Property and equipment, net	$ 0	0	$ 0	0
Right Of Use Asset [Member]
Summary Of Significant Accounting Policies [Line Items]
Impairment of long-lived assets				11,000
Property and equipment, net		$ 0		$ 0

Revenue (Narrative) (Details)

Revenue (Narrative) (Details) item in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2020USD ($)item	Dec. 31, 2019USD ($)	Mar. 31, 2020USD ($)	Jan. 31, 2018USD ($)	Sep. 30, 2014USD ($)
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Lease term	30 years		30 years
Lease extension	10 years		10 years
Commission costs	$ 126,000		$ 126,000
Revenue recognized			600,000
Contract liability	2,900,000		2,900,000		$ 3,500,000	$ 600,000
Cost of Revenue [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract and contract acquisition costs				$ 178,000
Sales [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract and contract acquisition costs				258,000
Spectrum [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue recognized	$ 183,000	$ 183,000	$ 547,000	$ 547,000
Contract liability							$ 7,500,000
Contractual term	10 years		10 years
TeamConnect LLC [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Service fee term			24 months
Goosetown And A BEEP [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Service transition period			2 years
Recurring revenue term			2 years
Service fee term			2 years
Purchased Customers [Member] | Maximum [Member] | Goosetown And A BEEP [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Recurring revenue	100.00%		100.00%
Purchased Customers [Member] | Minimum [Member] | Goosetown And A BEEP [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Recurring revenue	20.00%		20.00%
Diga-Talk Plus [Member] | A BEEP [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Service fee term			2 years
Diga-Talk Plus [Member] | Goosetown [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Recurring revenue	20.00%		20.00%
Recurring revenue term			2 years
Diga-Talk Plus [Member] | Maximum [Member] | A BEEP [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Recurring revenue	35.00%		35.00%
Diga-Talk Plus [Member] | Minimum [Member] | A BEEP [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Recurring revenue	15.00%		15.00%
Ameren [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Number of people | item			7.5
Lease term	30 years		30 years
Lease extension	10 years		10 years
Scheduled prepayments	$ 48,000,000		$ 48,000,000
Percentage of prepayments	50.00%		50.00%
Ameren [Member] | Maximum [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Lease term	40 years		40 years

Revenue (Narrative 2) (Details)

Revenue (Narrative 2) (Details)	Dec. 31, 2020
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-09-06
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Service revenue payment terms	30 days

Revenue (Schedule of Contract A

Revenue (Schedule of Contract Assets) (Details) - USD ($) $ in Thousands	9 Months Ended
	Dec. 31, 2020	Dec. 31, 2020
Revenue [Abstract]
Balance
Additions	126
Amortization
Impairment
Balance	126
Capitalized Contract Cost, Net, Classified [Abstract]
Balance	$ 126	$ 126
Less amount classified as current assets - included in prepaid expenses and other current assets		(4)
Noncurrent assets - included in other assets		$ 122

Intangible Assets (Narrative) (

Intangible Assets (Narrative) (Details) - USD ($)	1 Months Ended		3 Months Ended			9 Months Ended
	Sep. 30, 2020	Aug. 31, 2020	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Mar. 31, 2020	Jan. 31, 2018
Acquired Indefinite-lived Intangible Assets [Line Items]
impairment charges			$ 0		$ 0	$ 0	$ 0
Acquisitions						11,600,000
(Gain)/loss from disposal of intangible assets, net					$ (140,000)	(3,849,000)	$ (140,000)
Loss form disposal				$ (4,700,000)
Book value			118,066,000			118,066,000		$ 111,526,000
Contract liability			2,900,000			2,900,000		3,500,000	$ 600,000
Wireless Licenses [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Acquisitions						11,589,000
Book value			$ 118,066,000			$ 118,066,000		$ 111,526,000
Spectrum Licenses [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
(Gain)/loss from disposal of intangible assets, net	$ 1,100,000
Estimated fair value	200,000
Book value	300,000
Payment	$ 1,200,000
Reprogramming [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
(Gain)/loss from disposal of intangible assets, net		$ 300,000

Intangible Assets (Schedule of

Intangible Assets (Schedule of Indefinite-Lived Intangible Assets) (Details) $ in Thousands	9 Months Ended
	Dec. 31, 2020USD ($)
Indefinite-lived Intangible Assets [Line Items]
Balance	$ 111,526
Acquisitions	11,600
Balance	118,066
Wireless Licenses [Member]
Indefinite-lived Intangible Assets [Line Items]
Balance	111,526
Acquisitions	11,589
Exchanges - licenses received	196
Exchanges - licenses surrendered	(262)
Cancellations	(4,983)
Balance	$ 118,066

Equity Method Investment (Narra

Equity Method Investment (Narrative) (Details)	Dec. 31, 2020
TeamConnect LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage	19.50%

Equity Method Investment (Equit

Equity Method Investment (Equity Method Investment) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Equity method investment carrying value			$ 39
Share of net loss from LLC	$ (7)	$ (23)	(23)	$ (8)
Equity method investment carrying value	16		16
TeamConnect LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment carrying value			39
Share of net loss from LLC			(23)
Equity method investment carrying value	$ 16		$ 16

Related Party Transactions (Det

Related Party Transactions (Details) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Mar. 31, 2020	Jan. 31, 2018	Sep. 30, 2014
Related Party Transaction [Line Items]
Consulting fees	$ 2,672,000	$ 1,404,000	$ 13,245,000	$ 4,393,000
Contract liability	2,900,000		2,900,000		$ 3,500,000	$ 600,000
Revenue recognized			600,000
Rachelle B. Chong [Member]
Related Party Transaction [Line Items]
Consulting fees	36,000		96,000
Payable to related parties	0		0
Brian D. McAuley [Member]
Related Party Transaction [Line Items]
Consulting fees			$ 40,000
Shares issued for services			18,761
Motorola [Member]
Related Party Transaction [Line Items]
Purchase of equipment	0		$ 0	11,000
Revenue recognized	183,000	183,000	547,000	547,000
Equipment Supplier [Member]
Related Party Transaction [Line Items]
Payable to related parties	120,000		120,000		98,000
Spectrum [Member]
Related Party Transaction [Line Items]
Contract liability							$ 7,500,000
Revenue recognized	183,000	183,000	$ 547,000	547,000
TeamConnect LLC [Member]
Related Party Transaction [Line Items]
Service fee term			24 months
TeamConnect LLC [Member] | PDVConnect [Member]
Related Party Transaction [Line Items]
Contract liability	1,000		$ 1,000		$ 12,000
Recurring revenue term			48 months
Goosetown And A BEEP [Member]
Related Party Transaction [Line Items]
Service fee term			2 years
Recurring revenue term			2 years
Goosetown And A BEEP [Member] | PDVConnect [Member]
Related Party Transaction [Line Items]
Revenue recognized	$ 176,000	$ 215,000	$ 529,000	$ 729,000

Impairment and Restructuring _3

Impairment and Restructuring Charges (Narrative) (Details)	Dec. 31, 2018employee	Jun. 01, 2018employee	Aug. 31, 2018employee	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Mar. 31, 2020USD ($)
Restructuring Cost and Reserve [Line Items]
Impairment of long-lived assets				$ 11,000	$ 33,000	$ 40,000	$ 33,000
Property and equipment, net				3,752,000		3,752,000		$ 7,000,000
April 2018 And June 2018 Restructuring Activities [Member]
Restructuring Cost and Reserve [Line Items]
Positions eliminated | employee		20
Percentage of positions eliminated		20.00%
December 2018 Cost Reductions [Member]
Restructuring Cost and Reserve [Line Items]
Positions eliminated | employee	20
Percentage of positions eliminated	30.00%
Expected restructuring charges				36,000		36,000
Severance costs				45,000	34,000	42,000	206,000
Facility exit							28,000
August 2018 Cost Reductions [Member]
Restructuring Cost and Reserve [Line Items]
Positions eliminated | employee			7
Property, Plant and Equipment [Member]
Restructuring Cost and Reserve [Line Items]
Impairment of long-lived assets				11,000		40,000	22,000
Property and equipment, net				$ 0	0	$ 0	0
Right Of Use Asset [Member]
Restructuring Cost and Reserve [Line Items]
Impairment of long-lived assets							11,000
Property and equipment, net					$ 0		$ 0

Impairment and Restructuring _4

Impairment and Restructuring Charges (Schedule of Accrued Restructuring Charges) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
April 2018 And June 2018 Restructuring Activities [Member]
Restructuring Reserve [Roll Forward]
Balance			$ 565
Cash payments			(565)
Balance
December 2018 Cost Reductions [Member]
Restructuring Reserve [Roll Forward]
Balance			71
Severance costs	45	$ 34	42	$ 206
Cash payments			(77)
Balance	$ 36		$ 36

Leases (Narrative) (Details)

Leases (Narrative) (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Lease [Line Items]
Lease extension		10 years		10 years
Lease rent expense		$ 700	$ 700	$ 2,000	$ 2,000
Decrease in ROU	$ 19
Decrease in liability	20
Gain on disposal	$ 1			6	(62)
Cost of Revenue [Member]
Lease [Line Items]
Lease rent expense		400	400	1,200	1,200
Operating Expense [Member]
Lease [Line Items]
Lease rent expense		$ 300	$ 300	$ 800	$ 800

Leases (Additional Lease Cost I

Leases (Additional Lease Cost Information) (Details)	Dec. 31, 2020	Dec. 31, 2019
Lease, Cost [Abstract]
Weighted average term - operating lease liabilities	4 years 6 months 4 days	5 years 2 months 9 days
Weighted average incremental borrowing rate – operating lease liabilities	13.00%	13.00%

Leases (Lease Cost) (Details)

Leases (Lease Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Lease, Cost [Abstract]
Operating lease cost (cost resulting from lease payments)	$ 619	$ 662	$ 1,890	$ 1,952
Short term lease cost	50	10	93	42
Sublease income		(4)	(6)	(13)
Net lease cost	$ 669	$ 668	$ 1,977	$ 1,981

Leases (Supplemental Lease Info

Leases (Supplemental Lease Information) (Details) - USD ($) $ in Thousands	9 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Mar. 31, 2020
Leases [Abstract]
Operating lease - operating cash flows (fixed payments)	$ 2,096	$ 2,012
Operating lease - operating cash flows (liability reduction)	1,289	1,044
Right of use assets obtained in exchange for new operating lease liabilities	77	7,904
Non-current assets - right of use assets, net	5,404	6,500	$ 6,500
Current liabilities - operating lease liabilities	1,529	1,695	1,695
Non-current liabilities - operating lease liabilities	$ 5,928	$ 7,051	$ 7,051

Leases (Future Minimum Payments

Leases (Future Minimum Payments) (Details) $ in Thousands	Dec. 31, 2020USD ($)
Leases [Abstract]
2021 (excluding the nine months ended December 31, 2020)	$ 637
2022	2,297
2023	2,132
2024	1,930
2025	1,524
After 2025	1,373
Total future minimum lease payments	9,893
Amount representing interest	(2,436)
Present value of net future minimum lease payments	$ 7,457

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Dec. 31, 2020	Dec. 31, 2020	Mar. 31, 2020
Income Tax Disclosure [Line Items]
Net NOL carryforwards	$ 27,000	$ 27,000
Net operating loss carryforwards, no expiration	42,800	42,800
Tax expense/benefit	155	311
Internal Revenue Service (IRS) [Member]
Income Tax Disclosure [Line Items]
Deferred tax liabilitiy	1,600	1,600	$ 200
Net NOL carryforwards	$ 33,500	$ 33,500	211,900
Net operating loss carryforwards, no expiration			86,600
Net operating loss carryforwards			125,300
State [Member]
Income Tax Disclosure [Line Items]
Deferred tax liabilitiy			1,400
Net NOL carryforwards			112,700
Net operating loss carryforwards, no expiration			20,100
Net operating loss carryforwards			$ 92,600
Minimum [Member] | Federal and State [Member]
Income Tax Disclosure [Line Items]
Operating loss carryforwards, expiration year		Jan. 1, 2020
Maximum [Member] | Federal and State [Member]
Income Tax Disclosure [Line Items]
Operating loss carryforwards, expiration year		Dec. 31, 2040

Stock Acquisition Rights, Sto_3

Stock Acquisition Rights, Stock Options and Warrants (Narrative) (Details) - USD ($)	Oct. 22, 2020	Jun. 24, 2020	Feb. 28, 2020	Sep. 15, 2014	Dec. 31, 2020	Dec. 31, 2019	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Jul. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reversed stock compensation expense					$ 1,000			$ 1,000
Sale of stock, price per share										$ 45
Subsidiary equity units for which investor has right to convert to common stock					500,000			500,000
2014 Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock authorized and reserved for issuance					4,147,985			4,147,985
Shares available					833,413			833,413
Additional common stock authorized and reserved for future issuance								879,216
Percentage of increase in number of shares of common stock issued and outstanding								5.00%	5.00%
Common Class B Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Conversion ratio								one
Common Class A [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of units owned					100.00%			100.00%
PDV Spectrum Holding Company, LLC [Member] | Common Class B Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Proceeds from investment, shares				500,000
Sale of stock, price per share				$ 20
Stock issued during period value to purchase of assets				$ 10,000,000
First Anniversary [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of vesting for stock granted to employees		25.00%
Performance-Based Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense								$ 800,000
Options, Granted			67,562
Performance-Based Stock Options [Member] | Additional [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, Granted			14,635
Performance-Based Stock Options [Member] | First Anniversary [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of vesting for stock granted to employees			50.00%
Performance-Based Stock Options [Member] | First Anniversary [Member] | Additional [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of vesting for stock granted to employees			100.00%
Performance-Based Stock Options [Member] | Second Anniversary [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of vesting for stock granted to employees			50.00%
Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense					$ 400,000	$ 300,000		$ 900,000	$ 1,300,000
Unvested compensation expense					2,200,000			$ 2,200,000
Weighted average period of recognition of unrecognized compensation cost								1 year 6 months
Vesting term		10 years
Options, Granted		60,558						123,058
Expected term								6 years 26 days
Dividend yield								0.00%
Stock Option [Member] | Senior Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, Granted	62,500
Expected term	10 years
Stock Option [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate								0.43%
Volatility								53.41%
Forfeiture rate								0.00%
Stock Option [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate								0.51%
Volatility								52.43%
Forfeiture rate								2.00%
Stock Option [Member] | First Anniversary [Member] | Senior Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of vesting for stock granted to employees	25.00%
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense					2,300,000	$ 1,100,000		$ 7,200,000	$ 3,100,000
Unvested compensation expense					14,400,000			$ 14,400,000
Weighted average period of recognition of unrecognized compensation cost								2 years 6 months
Restricted Stock [Member] | Type III [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense								$ 800,000
Performance-Based Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense					0		$ 4,300,000
Percentage of shares expired								50.00%
Unvested compensation expense					0			$ 0
Stock issued during period			95,538				91,216
Shares forfeited								33,780
Performance-Based Restricted Stock Units [Member] | Additional [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock issued during period			43,446
Performance-Based Restricted Stock Units [Member] | Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reversed stock compensation expense					65,000			$ 65,000
Unvested compensation expense					$ 1,100,000			$ 1,100,000
Shares forfeited		60,098
Vesting, cumulative spectrum proceeds monetized		30,049
Performance-Based Restricted Stock Units [Member] | Stretch Goal [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares forfeited								47,768
Performance-Based Restricted Stock Units [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting, cumulative spectrum proceeds monetized								0
Performance-Based Restricted Stock Units [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting, cumulative spectrum proceeds monetized								200
Performance-Based Restricted Stock Units [Member] | Maximum [Member] | Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting, cumulative spectrum proceeds monetized		60,098
Performance-Based Restricted Stock Units [Member] | First Anniversary [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of vesting for stock granted to employees								50.00%
Performance-Based Restricted Stock Units [Member] | First Anniversary [Member] | Additional [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of vesting for stock granted to employees			100.00%
Performance-Based Restricted Stock Units [Member] | Second Anniversary [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of vesting for stock granted to employees								50.00%

Stock Acquisition Rights, Sto_4

Stock Acquisition Rights, Stock Options and Warrants (Summary of Restricted Stock and Restricted Stock Units Activity) (Details) - Restricted Stock [Member]	9 Months Ended
	Dec. 31, 2020$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Outstanding | shares	352,194
Stock, Granted | shares	286,155
Stock, Forfeited | shares	(7,350)
Stock, Vested | shares	(165,494)
Stock Outstanding | shares	465,505
Weighted Average Grant Date Fair Value, Stock Outstanding | $ / shares	$ 37.93
Weighted Average Grant Date Fair Value, Stock, Granted | $ / shares	47.10
Weighted Average Grant Date Fair Value, Stock, Forfeited | $ / shares	(36.75)
Weighted Average Grant Date Fair Value, Stock, Vested | $ / shares	40.15
Weighted Average Grant Date Fair Value, Stock Outstanding | $ / shares	$ 42.80

Stock Acquisition Rights, Sto_5

Stock Acquisition Rights, Stock Options and Warrants (Summary of Performance Stock Activity) (Details) - Performance-Based Restricted Stock Units [Member]	9 Months Ended
	Dec. 31, 2020$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Outstanding | shares	138,984
Stock, Granted | shares	60,098
Stock, Forfeited | shares	(77,817)
Stock, Vested | shares	(91,216)
Stock Outstanding | shares	30,049
Weighted Average Grant Date Fair Value, Stock Outstanding | $ / shares	$ 46.85
Weighted Average Grant Date Fair Value, Stock, Granted | $ / shares	43.76
Weighted Average Grant Date Fair Value, Stock, Forfeited | $ / shares	48.04
Weighted Average Grant Date Fair Value, Stock, Vested | $ / shares	46.85
Weighted Average Grant Date Fair Value, Stock Outstanding | $ / shares	$ 37.60

Stock Acquisition Rights, Sto_6

Stock Acquisition Rights, Stock Options and Warrants (Summary of Stock Option Activity) (Details) - Stock Option [Member] - $ / shares	Jun. 24, 2020	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding		1,807,466
Options, Granted	60,558	123,058
Options, Exercised		(154,729)
Options, Forfeited/Expired		(2,500)
Options Outstanding		1,773,295
Weighted Average Exercise Price, Options outstanding		$ 23.93
Weighted Average Exercise Price, Granted		42.04
Weighted Average Exercise Price, Exercised		22.78
Weighted Average Exercise Price, Forfeited/Expired		20
Weighted Average Exercise Price, Options outstanding		$ 25.30

Stock Acquisition Rights, Sto_7

Stock Acquisition Rights, Stock Options and Warrants (Summary of Performance Stock Options) (Details) - Performance-Based Stock Options [Member] - $ / shares	Feb. 28, 2020	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding		82,197
Options, Granted	67,562
Options, Exercised
Options, Forfeited/Expired		(33,780)
Options Outstanding		48,417
Weighted Average Exercise Price, Options outstanding		$ 46.85
Weighted Average Exercise Price, Granted
Weighted Average Exercise Price, Exercised
Weighted Average Exercise Price, forfeited/expired		(46.85)
Weighted Average Exercise Price, Options outstanding		$ 46.85

Concentrations of Credit Risk (

Concentrations of Credit Risk (Details)	9 Months Ended
	Dec. 31, 2020item
Credit Concentration Risk [Member]
Concentration Risk [Line Items]
Number of carriers	1

Business Concentrations (Detail

Business Concentrations (Details) - item	3 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Mar. 31, 2020
Tier 1 Carrier Partner [Member] | Sales Revenue, Services, Net [Member] | Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Number of carriers	1		1
Concentration risk, percentage	20.00%		21.00%
Tier 1 Carrier Partner [Member] | Accounts Receivable [Member]
Concentration Risk [Line Items]
Number of carriers			1
Tier 1 Carrier Partner [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration risk, percentage			89.00%
Domestic Carriers [Member]
Concentration Risk [Line Items]
Number of carriers				1
Domestic Carriers [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Number of carriers					1
Concentration risk, percentage					71.00%
Reseller [Member]
Concentration Risk [Line Items]
Number of resellers				1
Domestic Carrier And Reseller [Member] | Sales Revenue, Services, Net [Member] | Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration risk, percentage		23.00%		23.00%