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Schedule of Common Stock Shares Reserved for Issuance and Shares Available for Grant (Detail) - shares
Dec. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Compensation Related Costs Share Based Payments Disclosure [Line Items]      
Shares of common stock reserved for issuance under the plans 3,973,228 3,048,877  
Shares of common stock available for future grants 2,325,102 1,891,231  
Predecessor      
Compensation Related Costs Share Based Payments Disclosure [Line Items]      
Shares of common stock reserved for issuance under the plans     1,900,769
Shares of common stock available for future grants     505,221