Commitments And Contingencies Disclosure [Line Items]

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Entity number of employees separated.

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Lease expiration month and year.

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Warranty term.

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Amount of liability for consideration received or receivable from customer which is not included in transaction price, when consideration is expected to be refunded to customer, classified as current.

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers. For classified balance sheets, represents the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Date the restructuring activities were initiated or are expected to be initiated, in CCYY-MM-DD format.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Commitments and Contingencies - Additional Information (Detail) $ in Thousands		3 Months Ended		6 Months Ended		12 Months Ended
	Aug. 07, 2019	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($) Employee	Dec. 31, 2019 USD ($) Employee
Commitments And Contingencies Disclosure [Line Items]
Restructuring and related activities initiation date	Aug. 07, 2019
Restructuring expenses		$ 60	$ 11	$ 60	$ 98	$ 100	$ 500
Number of employees \| Employee						12	84
Lease expiration month and year				2020-10
Refund liability		205		$ 205		$ 146
Warranties		284	268	284	268	285	$ 444
Warranty Reserves [Member]
Commitments And Contingencies Disclosure [Line Items]
Refund liability		200		200		$ 100
Warranties		$ 300	$ 300	$ 300	$ 300
Warranty Reserves [Member] \| Antenna [Member]
Commitments And Contingencies Disclosure [Line Items]
Repair and replacement warranty				5 years