Income Taxes - Components of Income Tax Benefit (Provision) (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Current tax benefit (provision):      
Federal   $ (49)  
State (3) (2) (2)
Foreign (11)    
Total (14) (51) (2)
Deferred tax benefit (provision):      
Federal (437) (205) 485
State (2) (200) 26
Total (439) (405) 511
Change in valuation allowance 439 405 (511)
Benefit (provision) for income taxes $ (14) $ (51) $ (2)