Subsequent Events - Additional Information (Detail) - USD ($) $ in Millions			9 Months Ended
	Nov. 04, 2020	Oct. 08, 2020	Sep. 30, 2020	Mar. 31, 2020
Maximum [Member]
Subsequent Event [Line Items]
Stock repurchase program, authorized amount				$ 7.0
PCTEL Tianjin [Member]
Subsequent Event [Line Items]
Lessee, operating lease, option to extend			On March 5, 2020, PCTEL (Tianjin) Wireless Telecommunications Products, Co. Ltd., a wholly-owned subsidiary of the Company (“PCTEL Tianjin”), entered into the Letter agreement with Wang Zhuang Village Committee of Tianjin, China specifying the terms for extension of the lease of the premises on which PCTEL Tianjin currently conducts its manufacturing activities in Tianjin, China (the “Tianjin Lease”) to October 2022.  The Letter Agreement did not, however, effect the lease extension. The Tianjin Lease expired on October 8, 2020 without extension.  On October 16, 2020, the Wang Zhuang Village Committee issued a notice informing PCTEL Tianjin that the Chinese Party Central Committee and the State Council are accelerating the layout optimization and transformation of the industrial park in which the leased premises is located, and accordingly leases and lease extensions for all premises in the industrial park have been suspended and rent collection has been postponed. The letter indicates that if the Tianjin Lease extension is subsequently approved, the rent for the period from October 9, 2020 to the date of the Tianjin Lease extension (the “Intervening Period”) will then be due and payable.  If the Tianjin Lease extension is not approved, PCTEL Tianjin will need to vacate the premises and no rent will be due for the Intervening Period.  PCTEL Tianjin has not received an indication of the likelihood of approval of the Tianjin Lease extension, the length of the Intervening Period or the notice period for vacating the leased premises; provided, however, based upon past practices and verbal assurances, the Company believes that PCTEL Tianjin will have not less than 30 days to vacate the leased premises if the Lease Extension is not approved.
Subsequent Events [Member]
Subsequent Event [Line Items]
Stock repurchase program, authorized amount	$ 5.0
Stock repurchase program, start date	Nov. 10, 2020
Stock repurchase program, expiration date	Dec. 31, 2021
Subsequent Events [Member] | Maximum [Member]
Subsequent Event [Line Items]
Stock repurchase program, authorized amount	$ 5.0
Subsequent Events [Member] | PCTEL Tianjin [Member]
Subsequent Event [Line Items]
Lease expiration date		Oct. 08, 2020