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Share-Based Payment - Summary of Right to Acquire Shares for Price Originally Paid by Participant, Less an Applicable Discount (Details)
 12 Months Ended
Dec. 31, 2017
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Time remaining to the end of the Lock-up period  10 years
7-10 years  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Discount 2500.00%
Monthly Installments   Up to 120
3-7 years  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Discount 2000.00%
Monthly Installments   Up to 60
0-3 years  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Discount 1500.00%
Monthly Installments   Up to 36
Bottom of range | 7-10 years  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Time remaining to the end of the Lock-up period  7 years
Bottom of range | 3-7 years  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Time remaining to the end of the Lock-up period  3 years
Bottom of range | 0-3 years  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Time remaining to the end of the Lock-up period  0 years
Top of range | 7-10 years  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Time remaining to the end of the Lock-up period  10 years
Top of range | 3-7 years  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Time remaining to the end of the Lock-up period  7 years
Top of range | 0-3 years  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Time remaining to the end of the Lock-up period  3 years