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Summary Of Significant Accounting Policies - Disclosure of Foreign Exchange Rates (Detail)
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
U.S. Dollar [member]      
Disclosure of foreign exchange rates [line items]      
Average rate 1.2097 1.0824  
Closing rate 1.1658   1.1993
Swiss Franc [member]      
Disclosure of foreign exchange rates [line items]      
Average rate 1.1696 1.0765  
Closing rate 1.1569   1.1702
Czech Republic, Koruny [member]      
Disclosure of foreign exchange rates [line items]      
Average rate 25.4992 26.7809  
Closing rate 26.0200   25.5349