Annual report pursuant to Section 13 and 15(d)

Income Taxes - Additional Information (Detail)

v3.10.0.1
Income Taxes - Additional Information (Detail) - USD ($)
5 Months Ended 12 Months Ended
May 31, 2018
May 31, 2018
Dec. 31, 2017
May 31, 2017
May 31, 2016
Schedule Of Income Taxes [Line Items]          
Net deferred tax benefit (expense)   $ 0   $ 0 $ 0
Effective income tax rate reconciliation, at blended income tax rate, percent 28.62% 28.60%      
Federal statutory income tax rate 21.00% 28.60% 35.00% 34.00% 34.00%
Net operating loss $ 139,200,000 $ 139,200,000   $ 95,600,000 $ 69,100,000