Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Income Taxes Disclosure [Line Items]
Income tax expense (benefit)	$ 566,000	$ 483,000	$ 1,764,000	$ 430,000
Statutory rate			34.00%	34.00%
Valuation allowance	700,000		700,000		700,000
Domestic deferred tax assets ratable reversal pattern period			15 years
Operating loss carryforwards, Expiration period			The carryforward rules allow for up to a 20 year carryforward of net operating losses
Net operating loss carry forward period			20 years
Average period required to utilize future income			27 years 6 months
Gross unrecognized tax benefit	1,400,000		1,400,000		1,400,000
Period decrease in unrecognized tax benefits related to research credits			12 months
Undistributed cumulative earnings of foreign subsidiaries	1,000,000		1,000,000
Pctel Secure [Member]
Income Taxes Disclosure [Line Items]
Tax gain related to sale			$ 700,000