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Summary Of Significant Accounting Policies - Disclosure of Foreign Exchange Rates (Detail)
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
U.S. Dollar [member]      
Disclosure of foreign exchange rates [line items]      
Average rate 1.1297 1.2097  
Closing rate 1.1380   1.1450
Swiss Franc [member]      
Disclosure of foreign exchange rates [line items]      
Average rate 1.1294 1.1696  
Closing rate 1.1105   1.1269
Czech Republic, Koruny [member]      
Disclosure of foreign exchange rates [line items]      
Average rate 25.6842 25.4992  
Closing rate 25.4470   25.7240