Annual report pursuant to Section 13 and 15(d)

Stock Option Plans (Summary Of Stock Option Plans) (Detail)

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Stock Option Plans (Summary Of Stock Option Plans) (Detail) - shares
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Stock Option Plan [Line Items]        
Stock Options Plans, Outstanding 1,510,244 1,084,298 1,022,789  
Available for future issuance under plan 1,045,143 1,027,375 744,295  
Totals authorized by plan 2,555,387 2,111,673 1,767,084  
2007 Plan        
Stock Option Plan [Line Items]        
Stock Options Plans, Outstanding 10,665 21,977 37,447  
Available for future issuance under plan 0 0 0  
Totals authorized by plan 10,665 21,977 37,447  
2009 Plan        
Stock Option Plan [Line Items]        
Stock Options Plans, Outstanding 117,094 132,771 120,842  
Available for future issuance under plan 0 0 0  
Totals authorized by plan 117,094 132,771 120,842  
2014 Plan        
Stock Option Plan [Line Items]        
Stock Options Plans, Outstanding 1,382,485 929,550 864,500  
Available for future issuance under plan 1,045,143 1,027,375 744,295  
Totals authorized by plan 2,427,628 1,956,925 1,608,795 1,000,000