Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Income Tax Disclosure
Liability for unrecognized tax benefit, including related estimates of penalties and interest	$ 0	$ 0	$ 0	$ 1,000
Income tax provision (benefit)	29,000	168,000	53,000	(204,000)
Projected annual effective tax rate	(0.45%)	(6.99%)	(0.47%)	3.78%
Tax benefit for federal alternative minimum tax credits and California R&D credits				107,000
Tax benefit on reversed deferred tax liabilities and recognized AMT and R&D credits				214,000
Statutory tax rate	34.00%	34.00%	34.00%	34.00%
Other Tax Benefits
Income Tax Disclosure
Tax benefit on reversed certain deferred tax liabilities associated with international operations				$ 107,000