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Goodwill and Intangible Assets, Net - Additional Information (Detail) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2013
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Business Acquisition [Line Items]          
Impairment charge     $ 2,800,000    
Impairment charges related to goodwill     0 $ 0 $ 0
Impairment charges related to definite-lived intangible assets     0 0 0
Amortization expenses of intangible assets     $ 600,000 $ 400,000 $ 300,000
Weighted-average remaining amortization period of intangible assets     10 years    
Core Nano Carrier Technology [Member]          
Business Acquisition [Line Items]          
Amortization period of intangible assets     10 years    
IPR&D [Member]          
Business Acquisition [Line Items]          
Impairment charge $ 2,800,000        
Other In-process Research and Development Program [Member]          
Business Acquisition [Line Items]          
Impairment charge   $ 800,000      
Hermes BioSciences, Inc. [Member]          
Business Acquisition [Line Items]          
Acquired IPR&D assets recognized in a business combination     $ 7,000,000    
Acquisition date     Oct. 06, 2009    
Acquired goodwill recognized in a business combination     $ 3,600,000    
Hermes BioSciences, Inc. [Member] | Core Nano Carrier Technology [Member]          
Business Acquisition [Line Items]          
Acquired intangible assets     3,200,000    
Hermes BioSciences, Inc. [Member] | Antibody Targeted Nanotherapeutic Program with Chemotherapy Drug [Member]          
Business Acquisition [Line Items]          
Acquired IPR&D assets recognized in a business combination     2,800,000    
Hermes BioSciences, Inc. [Member] | Nanotherapeutic Program with Chemotherapy Drug [Member]          
Business Acquisition [Line Items]          
Acquired IPR&D assets recognized in a business combination     3,400,000    
Hermes BioSciences, Inc. [Member] | Other In-process Research and Development Program [Member]          
Business Acquisition [Line Items]          
Acquired IPR&D assets recognized in a business combination     $ 800,000