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Trust Account - Additional Information (Detail)
 1 Months Ended 3 Months Ended 9 Months Ended
Jun. 16, 2016
USD ($)
Sep. 30, 2016
USD ($)
Employees
Sep. 30, 2016
USD ($)
Employees
Sep. 30, 2016
USD ($)
Employees
Aug. 01, 2016
Employees
Trust Account [Line Items]          
Wind-down expense     $ 2,694 $ 3,806,142  
Number of impacted employees | Employees         50
Trust Agreement [Member]          
Trust Account [Line Items]          
Fund transferred to trust under agreement $ 2,300,000        
Fund released to employees and tax authorities   $ 2,100,000 2,100,000 $ 2,100,000  
Wind-down expense     $ 3,800,000    
Number of impacted employees | Employees   50 50 50  
Negotiated discounts minimum percentage of severance amounts contributed into beneficial trust 50.00%        
Trustee fees   $ 36,000      
Fund refunded to the company under trust agreement   $ 115,000