Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Investments, Owned, Federal Income Tax Note [Line Items]
Valuation allowance	$ 27,151,000	$ 9,547,000
Income tax (expense) benefit	(254,000)
Net operation loss deduction	100,000
Investment tax credits and research and development credits scheduled to expire	2017
Liability for uncertain tax positions	2,600,000
Amount of unrecognized or expected tax benefits recorded in financial statement	1,100,000
Penalties related to income taxes	0	0	0
Unrecognized potential tax benefits	1,000,000
Number of period for which income tax is exempted	10 years
Decreased foreign taxes	335,000	651,000	1,300,000
Benefit of tax holiday on net income per share (diluted)	$ 0.01	$ 0.03	$ 0.06
Tax holiday additional renewal period	5 years
Cumulative undistributed earnings of foreign subsidiaries	11,100,000
Federal [Member]
Investments, Owned, Federal Income Tax Note [Line Items]
Net operation loss deduction	117,800,000
Operating loss carry forwards expiration year	2021
Tax credit carry forward amount	426,000
State and Local Jurisdiction [Member]
Investments, Owned, Federal Income Tax Note [Line Items]
Net operation loss deduction	144,900,000
Operating loss carry forwards expiration year	2019
Deferred tax asset	26,400,000
Federal [Member]
Investments, Owned, Federal Income Tax Note [Line Items]
Deferred tax asset	21,700,000
Malaysia [Member]
Investments, Owned, Federal Income Tax Note [Line Items]
Number of period for which income tax is exempted	5 years
Research [Member]
Investments, Owned, Federal Income Tax Note [Line Items]
Tax credit carry forward amount	171,000
Investment Credit [Member]
Investments, Owned, Federal Income Tax Note [Line Items]
Tax credit carry forward amount	$ 53,000