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Stockholders’ Equity and Stock Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands							1 Months Ended		3 Months Ended		6 Months Ended		9 Months Ended
	Sep. 07, 2021	Aug. 23, 2021	Feb. 01, 2021	Dec. 31, 2020	Feb. 28, 2020	Sep. 15, 2014	May 31, 2021	Dec. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Sep. 29, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Subsidiary equity units for which investor has right to convert to common stock									500,000		500,000
Stock Repurchase Program, Authorized Amount														$ 50,000
2014 Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock authorized and reserved for issuance									5,027,201		5,027,201
Shares available									1,205,398		1,205,398
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				879,216
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]
Stock issued during period value to purchase of assets						$ 10,000
Proceeds from investment, shares						500,000
Sale of stock, price per share						$ 20.00
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense									$ 2,400	$ 4,000	$ 5,000	$ 5,700
Unvested compensation expense									24,500		$ 24,500
Weighted average period of recognition of unrecognized compensation cost											3 years
Awards issued											348,683
Restricted Stock [Member] \| Selling, General and Administrative Expenses [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense									2,000	3,700	$ 4,300	5,300
Restricted Stock [Member] \| Research and Development Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense									200	200	400	300
Restricted Stock [Member] \| Sales And Support [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense									200	$ 62	300	$ 100
Restricted Stock [Member] \| Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards issued		50,000
Performance-Based Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage share payout					50.00%								50.00%
Awards issued					95,538					91,216
Performance-Based Restricted Stock Units [Member] \| Lease Agreements, 900 MHz [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards issued					43,446
Performance-Based Restricted Stock Units [Member] \| Selling, General and Administrative Expenses [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense										$ 4,300
Performance-Based Restricted Stock Units [Member] \| Chief Executive Officer [Member] \| CSPM [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested compensation expense									1,000		$ 1,000
Weighted average period of recognition of unrecognized compensation cost											3 years
Performance Metric											4 years
Performance-Based Restricted Stock Units [Member] \| Chief Executive Officer [Member] \| Selling, General and Administrative Expenses [Member] \| CSPM [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense									100		$ 200
Performance-Based Restricted Stock Units [Member] \| Stretch Goal [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage share payout					50.00%
Performance-Based Restricted Stock Units [Member] \| First Anniversary [Member] \| Lease Agreements, 900 MHz [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] \| First Anniversary [Member] \| Chief Executive Officer [Member] \| CSPM [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting if target metric achieved								15,025
Performance-Based Restricted Stock Units [Member] \| Second Anniversary [Member] \| Chief Executive Officer [Member] \| CSPM [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting if target metric achieved								30,049
Performance-Based Restricted Stock Units [Member] \| Third Anniversary [Member] \| Chief Executive Officer [Member] \| CSPM [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting if target metric achieved								60,098
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense									500		900
Unvested compensation expense									5,800		$ 5,800
Weighted average period of recognition of unrecognized compensation cost											1 year 10 months 24 days
Stock options forfeited							20,132
Adjustments to Additional Paid in Capital, Other							$ (1,000)
Stock options awarded										300,000	165,768	500,000
Stock Options [Member] \| Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options awarded		100,000
Share Based Compensation Arrangement By Share Based Payment Award, Expected Life		6 years 7 days
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Exercise Price		$ 57.00
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate		0.92%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate		53.18%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate		0.00%
Share based compensation arrangement by share based payment award, fair value assumptions, expected forfeiture rate		0.00%
Stock Options [Member] \| Executive Chairman [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options awarded	65,768
Share Based Compensation Arrangement By Share Based Payment Award, Expected Life	5 years 11 months 1 day
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Exercise Price	$ 60.92
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	0.96%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate	53.45%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	0.00%
Share based compensation arrangement by share based payment award, fair value assumptions, expected forfeiture rate	0.00%
Performance-Based Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options awarded											0
TSR Performance Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense									200		$ 400
Unvested compensation expense									$ 2,600		$ 2,600
Weighted average period of recognition of unrecognized compensation cost											3 years 5 months 1 day
Awards issued			45,000
TSR Performance Units [Member] \| Continued Service And Stock Price Levels [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of vesting for stock granted to employees											25.00%
TSR Performance Units [Member] \| Continued Service And Stock Price Levels [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of vesting for stock granted to employees											350.00%