XML 80 R43.htm IDEA: XBRL DOCUMENT v3.8.0.1
Significant Accounting Policies - Summery of Amortization Method and Amortization Period for the Principal Categories of Intangible Assets (Details)
12 Months Ended
Dec. 31, 2017
Patents  
Disclosure Of Intangible Assets [Line Items]  
Amortization method Straight-line
Amortization rate 20 years
Computer Software  
Disclosure Of Intangible Assets [Line Items]  
Amortization method Straight-line
Computer Software | Minimum [Member]  
Disclosure Of Intangible Assets [Line Items]  
Amortization rate 3 years
Computer Software | Maximum  
Disclosure Of Intangible Assets [Line Items]  
Amortization rate 5 years