Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - Changes in Accumulated Other Comprehensive Income, Net of Income Taxes (Detail)

v3.6.0.2
Stockholders' Equity - Changes in Accumulated Other Comprehensive Income, Net of Income Taxes (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance $ 457    
Other comprehensive (loss) income before reclassifications 443    
Amounts reclassified from accumulated other comprehensive (loss) income (90)    
Net current-period other (loss) comprehensive income 353 $ 298 $ 159
Ending balance 810 457  
Unrealized gains and (losses) of available-for-sale securities [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance (568)    
Other comprehensive (loss) income before reclassifications 403    
Amounts reclassified from accumulated other comprehensive (loss) income (90)    
Net current-period other (loss) comprehensive income 313    
Ending balance (255) (568)  
Foreign currency translation [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance 1,025    
Other comprehensive (loss) income before reclassifications 40    
Amounts reclassified from accumulated other comprehensive (loss) income 0    
Net current-period other (loss) comprehensive income 40    
Ending balance $ 1,065 $ 1,025