Stock-Based Compensation - Employee Stock Purchase Plan ("ESPP") - Additional Information (Detail) - Employee Stock Purchase Plan [Member] - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	Feb. 28, 2019	Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of fair market value to determine purchase price		85.00%
Offering period		6 months
Proceeds of from issuance of shares under ESPP	$ 0.3
Options issued	95,376,000	0
Change in date of plan description		In May 2019, the stockholders approved the PCTEL, Inc. 2019 Employee Stock Purchase Plan. The 2019 ESPP changed the beginnings of the six-month offering periods to April and October from February and August.
Rate of discount on fair market value of common stock under ESPP		15.00%
Period of expected life, options granted		5 years