Income Taxes - Schedule of Provision for Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
U.S. Federal tax expense (benefit) at statutory rates	$ 810	$ (1,041)
Increase (decrease) resulting from:
Tax credits	(27)	(138)
State income tax	4	(19)
International operations	(360)	(315)
Incentive stock options	70	17
Valuation allowance	(696)	3,614
Expiration of state NOLs	245	190
Other, net	(8)	(114)
Total Income tax expense	$ 38us-gaap_IncomeTaxExpenseBenefit	$ 2,194us-gaap_IncomeTaxExpenseBenefit
U.S. Federal tax expense (benefit) at statutory rates	34.00%	34.00%
Increase (decrease) resulting from:
Tax credits	(1.10%)	4.50%
State income tax	0.20%	0.60%
International operations	(15.20%)	10.30%
Incentive stock options	3.00%	(0.60%)
Valuation allowance	(29.20%)	(118.00%)
Expiration of state NOLs	10.30%	(6.20%)
Other, net	(0.40%)	3.70%
Tax expense and effective tax rate	1.60%	(71.70%)

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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