Quarterly report pursuant to Section 13 or 15(d)

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

v3.7.0.1
Stockholders' Equity - Changes in Accumulated Other Comprehensive Income, Net of Income Taxes (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance     $ 810  
Other comprehensive income (loss) before reclassifications     196  
Amounts reclassified from accumulated other comprehensive income (loss)     0  
Net current-period other comprehensive income (loss) $ 151 $ 414 196 $ 1,141
Ending balance 1,006   1,006  
Unrealized gains and (losses) of available-for-sale securities [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance     (255)  
Other comprehensive income (loss) before reclassifications     221  
Amounts reclassified from accumulated other comprehensive income (loss)     0  
Net current-period other comprehensive income (loss)     221  
Ending balance (34)   (34)  
Foreign currency translation [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance     1,065  
Other comprehensive income (loss) before reclassifications     (25)  
Amounts reclassified from accumulated other comprehensive income (loss)     0  
Net current-period other comprehensive income (loss)     (25)  
Ending balance $ 1,040   $ 1,040