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Share-Based Compensation - Additional Information (Details)
1 Months Ended 3 Months Ended
Jan. 03, 2019
USD ($)
$ / shares
shares
Oct. 12, 2018
shares
Jan. 01, 2018
shares
Dec. 31, 2019
USD ($)
Jun. 30, 2019
USD ($)
$ / shares
shares
Mar. 31, 2017
shares
Mar. 31, 2020
USD ($)
shares
Mar. 31, 2019
USD ($)
May 31, 2019
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Share-based compensation expense | $             $ 7,617,000 $ 7,447,000  
Unrecognized compensation cost of options and RSUs | $             $ 50,800,000    
Expected to be recognized over a weighted average period             1 year 11 months 12 days    
Options | General and Administrative Expenses                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Share-based compensation expense | $       $ 900,000          
Options | Elizabeth Barrett                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Option to purchase of ordinary shares 277,432                
Exercise price of option to purchase of ordinary shares | $ / shares $ 47.57                
Options | Non-employee Directors                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Options granted, expected term         10 years        
Awards vesting period         1 year        
Number of stock options approved for grants         70,000        
Stock options granted         10,000        
Exercise of option to ordinary shares conversion ratio         1        
Stock option exercise | $ / shares         $ 34.83        
Estimated fair value of options granted | $         $ 1,900,000        
Options | Chairman of Board of Directors                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Stock options granted         10,000        
Options | Tranche One                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Vesting percentage             33.00%    
Restricted Stock Units (RSUs)                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Awards vesting period             2 years    
Share-based compensation expense | $       $ 0          
Restricted Stock Units (RSUs) | Elizabeth Barrett                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Option to purchase of ordinary shares 317,065                
Restricted Stock Units (RSUs) | Tranche One                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Vesting percentage             33.00%    
2017 Equity Incentive Plan                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Maximum number of ordinary share issuable under the 2017 incentive plan           1,400,000 5,600,000    
Number of ordinary shares reserved for issuance, percentage             12.00%    
Increase in number of ordinary share issuable under the 2017 incentive plan   1,900,000 250,167            
Stock Options and Restricted Stock Units (RSUs) | Elizabeth Barrett                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Fair value | $ $ 24,100,000                
Plan | Options                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Awards vesting period             3 years    
Combined voting power percentage             10.00%    
Ordinary Shares | 2019 Inducement Plan                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Number of stock options approved for grants                 900,000
Ordinary Shares | 2017 Equity Incentive Plan                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Maximum number of ordinary share issuable under the 2017 incentive plan   3,550,167 1,650,167            
Maximum | Plan | Options                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Options granted, expected term             10 years    
Minimum | Plan | Options                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Exercise price of stock options as percentage of fair market value of shares on grant date             100.00%    
Stock options exercise price percentage for individuals possesses more than 10% of the combined voter power             110.00%