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Share based Compensation - HCML Share Option Scheme (Details) - shares
12 Months Ended
Jun. 15, 2016
Aug. 06, 2008
Jun. 04, 2005
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share option scheme expired in 2016            
Share-based Compensation            
Expiry period     10 years      
Aggregate number of shares issuable       184,518    
HCML Share Option Scheme            
Share-based Compensation            
Aggregate number of shares issuable       2,313,097    
Number of shares authorized but unissued       8,342,255    
Number of share options cancelled       120,845 6,875 3,750
Number of share options granted 593,686     1,060,626 150,000 693,686
HCML Share Option Scheme | Minimum            
Share-based Compensation            
Expiry period       8 years    
HCML Share Option Scheme | Maximum            
Share-based Compensation            
Expiry period       10 years    
HCML Share Option Scheme | Four-year awards            
Share-based Compensation            
Vesting period       4 years    
Vesting percentage upon first anniversary       25.00%    
Annual vesting percentage after the first anniversary       25.00%    
HMHL Share Option Scheme            
Share-based Compensation            
Expiry period   6 years        
Number of share options cancelled 1,187,372          
Ordinary Shares | HMHL Share Option Scheme            
Share-based Compensation            
Aggregate number of shares issuable       2,144,408    
Number of shares authorized but unissued       157,111,839    
Vesting period       4 years    
Vesting percentage upon first anniversary       25.00%    
Annual vesting percentage after the first anniversary       25.00%    
Ordinary Shares | HMHL Share Option Scheme | Six-year awards            
Share-based Compensation            
Expiry period       6 years    
Ordinary Shares | HMHL Share Option Scheme | Nine-year awards            
Share-based Compensation            
Expiry period       9 years