Quarterly report pursuant to Section 13 or 15(d)

License Agreements - Additional Information (Detail)

v3.8.0.1
License Agreements - Additional Information (Detail)
1 Months Ended
Jun. 30, 2016
USD ($)
Jun. 30, 2016
GBP (£)
Jun. 30, 2016
USD ($)
Jun. 30, 2016
GBP (£)
Feb. 28, 2018
USD ($)
May 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
GBP (£)
Jun. 30, 2016
GBP (£)
Licenses Agreements [Line Items]                  
License fee $ 807,000 £ 600,000              
Accrued license fee 425,000   $ 425,000   $ 83,400 $ 167,000 $ 807,000 £ 300,000 £ 300,000
Annual license fee $ 425,000 £ 300,000 $ 425,000 £ 300,000