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Intangible Assets, Net - Additional Information (Detail)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
Sep. 30, 2015
USD ($)
Finite-Lived Intangible Assets [Line Items]    
Estimated amortization expenses of intangible assets for the remainder of 2015 $ 14 $ 14
Estimated amortization expenses of intangible assets for 2016 56 56
Estimated amortization expenses of intangible assets for 2017 56 56
Estimated amortization expenses of intangible assets for 2018 56 56
Estimated amortization expenses of intangible assets for 2019 56 56
Estimated amortization expenses of intangible assets after 2019 474 474
Finite-Lived Intangible Assets [Member]    
Finite-Lived Intangible Assets [Line Items]    
Amortization of intangible assets $ 12 $ 40