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Share-Based Payment Awards - Performance-Based Stock Units - Additional Information (Detail) - Performance Stock Units [Member] - shares
1 Months Ended 6 Months Ended
Oct. 12, 2019
Mar. 19, 2019
Oct. 12, 2018
Mar. 19, 2018
Mar. 31, 2018
Dec. 31, 2018
Class of Stock [Line Items]            
Weighted average remaining vesting term           7 months
Performance Condition One [Member]            
Class of Stock [Line Items]            
Stock units vesting, percentage       50.00% 50.00%  
Portion of stock units subject to an FDA acceptance of the Company's NDA submission of YUTIQ for review on or before March 31, 2018         One third  
Number of Performance-Based Stock Units, vested       48,332    
Performance Condition Two [Member]            
Class of Stock [Line Items]            
Stock units vesting, percentage     50.00%      
Portion of stock units subject to an FDA approval of YUTIQ on or before March 31, 2019     Two-thirds      
Number of Performance-Based Stock Units, vested     96,668      
Scenario, Forecast [Member] | Performance Condition One [Member]            
Class of Stock [Line Items]            
Stock units vesting, percentage   50.00%        
Number of performance-based stock units subject to service-based vesting of one year from performance condition achievement date   48,334        
Scenario, Forecast [Member] | Performance Condition Two [Member]            
Class of Stock [Line Items]            
Stock units vesting, percentage 50.00%          
Number of performance-based stock units subject to service-based vesting of one year from performance condition achievement date 96,666