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Principal Activities and Reorganization - Additional Information (Detail)
12 Months Ended
Oct. 20, 2017
$ / shares
Dec. 31, 2019
$ / shares
Jun. 30, 2012
$ / shares
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Date of incorporation   Jun. 06, 2012  
Place of incorporation   Cayman Islands  
Share split, description   Each of ordinary share and preferred share of the Company was subdivided into 100 shares at a par value of US$0.00001  
Preferred stock shares converted and designated 100    
Ordinary shares, par value $ 0.00001 $ 0.00001 $ 0.00001
Preferred shares, par value $ 0.00001