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Significant Accounting Policies - Recently Issued Accounting Standards (Detail) - USD ($)
Jun. 30, 2018
Jan. 01, 2018
ASU 2014-09    
New accounting pronouncement, modified retrospective method    
Cumulative effect adjustment for full retrospective transition   $ 0
ASU 2017-01    
New accounting pronouncement, modified retrospective method    
Impact of adoption on financial statements $ 0  
ASU 2017-09    
New accounting pronouncement, modified retrospective method    
Impact of adoption on financial statements $ 0