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Sale of Intellectual Property - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2017
Finite-Lived Intangible Assets [Line Items]    
Revenue - other $ 552,000 $ 2,302,000
Intellectual property    
Finite-Lived Intangible Assets [Line Items]    
Proceeds from royalties 600,000  
Revenue - other $ 600,000 600,000
Royalty revenue   $ 0