Income Taxes - Schedule of Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
U.S. Federal tax expense at statutory rates	$ 2,231	$ 810
Increase (decrease) resulting from:
Tax credits	130	(27)
State income tax	14	4
International operations	20	(360)
Incentive stock options	(66)	70
Valuation allowance	(2,121)	(696)
Expiration of state net operating loss carryforwards	236	245
Other, net	26	(8)
Total Income tax expense	$ 470	$ 38
U.S. Federal tax expense at statutory rates	34.00%	34.00%
Increase (decrease) resulting from:
Tax credits	2.00%	(1.10%)
State income tax	0.20%	0.20%
International operations	0.30%	(15.20%)
Incentive stock options	(1.00%)	3.00%
Valuation allowance	(32.40%)	(29.20%)
Expiration of state net operating loss carryforwards	3.60%	10.30%
Other, net	0.40%	(0.40%)
Tax expense and effective tax rate	7.10%	1.60%