Payroll Tax, Employer, Deferral, CARES Act

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Amount of interest expense accrued for an underpayment of income taxes.

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Income Taxes - Narrative (Details) - USD ($)	12 Months Ended
Income Taxes - Narrative (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating Loss Carryforwards [Line Items]
Valuation allowance activity	$ 6,000,000	$ 26,400,000	$ 9,200,000
Employer payroll taxes deferred, CARES Act	1,400,000
Income tax benefit recognized related to uncertain tax positions	0	0
Interest expense related to uncertain tax positions	0	0
Liability related to unrecognized tax benefits	0	$ 0
Ctrack South Africa divestiture
Operating Loss Carryforwards [Line Items]
Valuation allowance activity	(10,000,000)
True-up of prior year deferred taxes
Operating Loss Carryforwards [Line Items]
Valuation allowance activity	3,000,000
Foreign currency
Operating Loss Carryforwards [Line Items]
Valuation allowance activity	(200,000)
Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	439,800,000
Operating loss carryforwards, not subject to expiration	110,000,000
Research and development tax credit carryforwards	14,200,000
California Franchise Tax Board
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	58,900,000
Research and development tax credit carryforwards	15,600,000
Foreign Tax Authority
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 24,300,000