Percentage of units owned.

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Share based compensation arrangement by share based payment award contractual life.

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Measurement Period

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Percentage Share Payout

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other Than Options, Vesting if Target Metric Achieved

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Share-based Compensation Arrangement By Share-based Payment Award, Fair Value Assumptions, Forfeiture Rate

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Share-based Compensation Arrangement by Share-based Payment Award, Options, Number of Vesting Installments

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Subsidiary equity units for which investor has right to convert to common stock.

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Amount of other increase (decrease) in additional paid in capital (APIC).

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Aggregate number of common shares reserved for future issuance.

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The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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Amount of cost to be recognized for option under share-based payment arrangement.

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The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

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Amount of expense for salary, wage, profit sharing; incentive and equity-based compensation; and other employee benefit.

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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

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Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

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The aggregate total amount of expenses directly related to the marketing or selling of products or services.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Number of additional shares authorized for issuance under share-based payment arrangement.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Maximum number of shares that may be issued in accordance with the plan as a proportion of outstanding capital stock.

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An excess of the fair value of the modified award over the fair value of the award immediately before the modification.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Percentage of vesting of award under share-based payment arrangement.

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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Value, before forfeiture, of shares issued under share-based payment arrangement. Excludes employee stock ownership plan (ESOP).

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Amount of stock repurchase plan authorized.

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Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one.

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Number of shares that have been repurchased during the period and are being held in treasury.

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Stock Acquisition Rights, Stock Options and Warrants - Narrative (Details)														1 Months Ended			12 Months Ended
	May 18, 2022 shares	Sep. 07, 2021 installment $ / shares shares	Aug. 23, 2021 installment $ / shares shares	Jun. 30, 2021 shares	Feb. 01, 2021 shares	Jan. 01, 2021 shares	Dec. 30, 2020 shares	Sep. 30, 2020 USD ($) shares	Jun. 24, 2020 shares	Feb. 28, 2020 shares	Jan. 13, 2020 USD ($) shares	Oct. 02, 2019 shares	Sep. 15, 2014 USD ($) $ / shares shares	May 31, 2021 USD ($) shares	May 31, 2020 USD ($) shares	Jan. 31, 2020 USD ($) shares	Mar. 31, 2022 USD ($) $ / shares shares	Mar. 31, 2021 USD ($) $ / shares shares	Mar. 31, 2020 USD ($) $ / shares shares	Sep. 29, 2021 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Product development																	$ 3,593,000	$ 4,343,000	$ 2,953,000
Sales and support																	4,461,000	2,942,000	$ 4,055,000
Options granted (in shares) \| shares		65,768	100,000
Granted (in dollars per share) \| $ / shares		$ 60.92	$ 57.00
Number of vesting installments \| installment		3	4
Accumulated deficit																	$ 313,829,000	$ 260,348,000
Number of shares repurchased (in shares) \| shares				20,132										20,132			252,000	0	0
Decrease in APIC														$ 1,000,000
Stock repurchase program, authorized amount																				$ 50,000,000
Conversion ratio													1
Non-cash compensation expense attributable to stock awards																	$ 13,625,000	$ 15,925,000	$ 5,826,000
General and administrative																	39,525,000	39,302,000	25,469,000
Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares converted (in shares) \| shares	500,000
Lease Agreements, 900 MHz [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense																	$ 100,000	$ 200,000
Stock options, contractual life																	20 years	30 years
2014 Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock authorized and reserved for issuance (in shares) \| shares																	5,027,201
Shares available \| shares																	1,216,868
Percentage of increase in number of shares of common stock issued and outstanding						5.00%											5.00%
Additional common stock authorized and reserved for future issuance (in shares) \| shares						879,216
Common Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of units owned													100.00%
PDV Spectrum Holding Company, LLC \| Common Class B Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity method investee, cumulative proceeds received on all transactions													$ 10,000,000
Sale of stock (in shares) \| shares													500,000
Sale of stock (in dollars per share) \| $ / shares													$ 20.00
PDV Spectrum Holding Company, LLC \| Common Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Subsidiary equity units for which investor has right to convert to common stock (in shares) \| shares													500,000
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense															$ 1,500,000		$ 9,700,000	$ 9,200,000	4,300,000
Product development																	700,000	600,000	200,000
Sales and support																	500,000	200,000	200,000
Plan modification, incremental cost																		800,000
Unvested compensation expense																	$ 18,400,000	$ 13,200,000
Weighted average period of recognition of unrecognized compensation cost																	2 years 6 months 10 days	2 years 4 months 9 days
Awards issued \| shares															28,000		362,073
Awards forfeited \| shares																	71,991
General and administrative																	$ 8,500,000	$ 8,400,000	$ 3,900,000
Performance-Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense																		$ 0
Consulting fees																$ 0
Awards issued \| shares								91,216		95,538							0
Awards forfeited \| shares																120,445	0	47,768
Expected term					4 years
Risk-free interest rate					0.29%
Volatility					56.09%
Dividend yield					0.00%
Forfeiture rate					0.00%
Non-cash compensation expense attributable to stock awards								$ 4,300,000
Performance-Based Restricted Stock Units \| Additional
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards issued \| shares										43,446
Performance-Based Restricted Stock Units \| Chief Executive Officer \| Cumulative Spectrum Proceeds Monetized
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense																	$ 300,000	$ 100,000
Unvested compensation expense																	$ 800,000	$ 1,000,000
Weighted average period of recognition of unrecognized compensation cost																	2 years 5 months 26 days	3 years 5 months 26 days
Measurement period									4 years
Vesting if target metric achieved (in shares) \| shares									30,049
Performance-Based Restricted Stock Units \| President and Chief Executive Officer \| TSR
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense																	$ 1,000,000	$ 200,000
Unvested compensation expense																	$ 2,300,000	$ 3,100,000
Weighted average period of recognition of unrecognized compensation cost																	2 years 11 months 4 days	3 years 8 months 15 days
Vesting if target metric achieved (in shares) \| shares					45,000
Performance-Based Restricted Stock Units \| 2014 Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards issued \| shares												11,307
Performance-Based Restricted Stock Units \| Minimum \| Cumulative Spectrum Proceeds Monetized
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage share payout																	0.00%
Performance-Based Restricted Stock Units \| Minimum \| Chief Executive Officer \| Cumulative Spectrum Proceeds Monetized
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting if target metric achieved (in shares) \| shares									15,025
Performance-Based Restricted Stock Units \| Minimum \| Chief Executive Officer \| TSR
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage share payout																	25.00%
Performance-Based Restricted Stock Units \| Maximum \| Chief Executive Officer \| Cumulative Spectrum Proceeds Monetized
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage share payout																	200.00%
Vesting if target metric achieved (in shares) \| shares									60,098
Performance-Based Restricted Stock Units \| Maximum \| Chief Executive Officer \| TSR
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage share payout																	350.00%
Performance-Based Restricted Stock Units \| First Anniversary
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of vesting for stock granted to employees										50.00%
Performance-Based Restricted Stock Units \| First Anniversary \| Additional
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 \| First Anniversary \| Minimum \| President and Chief Executive Officer \| TSR
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of vesting for stock granted to employees					25.00%
Performance-Based Restricted Stock Units \| First Anniversary \| Maximum \| President and Chief Executive Officer \| TSR
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of vesting for stock granted to employees					350.00%
Performance-Based Restricted Stock Units \| Second Anniversary
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of vesting for stock granted to employees										50.00%
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average period of recognition of unrecognized compensation cost																	1 year 5 months 19 days	1 year 3 months 25 days
Options granted (in shares) \| shares																	165,768
Granted (in dollars per share) \| $ / shares																	$ 58.56
Expected term		5 years 11 months 1 day	6 years 7 days															6 years 25 days	5 years 8 months 1 day
Risk-free interest rate		0.96%	0.92%																0.93%
Volatility		53.45%	53.18%																49.63%
Dividend yield		0.00%	0.00%														0.00%	0.00%	0.00%
Forfeiture rate		0.00%	0.00%														0.00%
Intrinsic value of options exercised																	$ 29,500,000	$ 5,000,000	$ 2,400,000
Weighted average grant-date fair value per option granted (in dollars per share) \| $ / shares																	$ 58.56	$ 42.04	$ 46.85
Unrecognized compensation cost related to non-vested share options granted																	$ 4,100,000	$ 1,800,000
Aggregate intrinsic value, exercisable																	$ 22,892,912
Stock Options \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term																	5 years 11 months 1 day
Risk-free interest rate																	0.92%	0.43%
Volatility																	53.18%	53.41%
Forfeiture rate																		0.00%	0.00%
Stock Options \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term																	6 years 7 days
Risk-free interest rate																	0.96%	0.51%
Volatility																	53.45%	52.43%
Forfeiture rate																		2.00%	2.00%
Performance-Based Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense													$ 0
Consulting fees											$ 0						$ 0	$ 800,000	$ 0
Unvested compensation expense																	$ 0	0
Options granted (in shares) \| shares										67,562							0		82,197
Granted (in dollars per share) \| $ / shares																	$ 0
Intrinsic value of options exercised																	$ 200,000	0	$ 0
Weighted average grant-date fair value per option granted (in dollars per share) \| $ / shares																			$ 46.85
Stock options forfeited (in shares) \| shares							33,780				179,945
Performance-Based Stock Options \| Additional
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in shares) \| shares										14,635
Performance-Based Stock Options \| First Anniversary
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 \| First Anniversary \| Additional
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 \| Second Anniversary
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of vesting for stock granted to employees										50.00%
Service-Based Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense																	$ 2,600,000	$ 1,300,000	$ 1,500,000