Quarterly report pursuant to Section 13 or 15(d)

Balance Sheet Components - Schedule of Estimated Future Amortization Expense of Intangible Assets (Detail)

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Balance Sheet Components - Schedule of Estimated Future Amortization Expense of Intangible Assets (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
2017 $ 241  
2018 321  
2019 321  
2020 321  
2021 321  
Thereafter 33  
Finite-Lived Intangible Assets, Net, Total $ 1,558 $ 1,638