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Income Taxes - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Taxes Disclosure [Line Items]      
Increase (Decrease) in valuation allowance $ (9,200,000) $ 11,800,000  
NOL carry forwards, net of limitations 100,100,000 47,100,000  
Unrecognized tax benefits 562,000 687,000 $ 811,000
Accrued interest and penalties related to unrecognized tax benefits 0 0  
Interest and penalties related to uncertain tax benefits 0 0  
Unrecognized tax benefits may be recognized by the end of 2016 $ 0    
Income tax examination description The Company is subject to U.S. federal, state and local income tax examinations by tax authorities for years 2001 through present. Carryforward attributes that were generated in earlier periods remain subject to examination to the extent the year in which they were used or will be used remains open for examination. The tax years which remain subject to examination by tax authorities in Israel, as of December 31, 2016, include years 2013 through the present.    
U.S. Federal [Member]      
Income Taxes Disclosure [Line Items]      
NOL carryforwards $ 24,500,000 55,500,000  
NOL carryforwards, expiration date Dec. 31, 2036    
U.S. State [Member]      
Income Taxes Disclosure [Line Items]      
NOL carryforwards $ 24,300,000 55,400,000  
NOL carryforwards, expiration date Dec. 31, 2036    
Foreign [Member]      
Income Taxes Disclosure [Line Items]      
NOL carryforwards $ 26,100,000 $ 25,600,000