XML 53 R41.htm IDEA: XBRL DOCUMENT v3.20.2
Other Comprehensive Income and Accumulated Other Comprehensive Income - Summary of Changes in Accumulated Other Comprehensive Income/(Loss), by Component (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Accumulated Other Comprehensive Income Loss [Line Items]            
Beginning balance $ 232,064 $ 258,997 $ 34,229 $ 159,086 $ 224,755 $ 160,972
Net other comprehensive income (loss) (2,088) (681) 1,164 (83) (1) 2
Ending balance 105,840 232,064 258,997 139,562 159,086 224,755
Unrealized Gains (Losses) from Marketable Securities [Member]            
Accumulated Other Comprehensive Income Loss [Line Items]            
Beginning balance 552 1,394        
Net other comprehensive income (loss) (430) (842) 1,394      
Ending balance 122 552 1,394      
Foreign Currency Translation Adjustment [Member]            
Accumulated Other Comprehensive Income Loss [Line Items]            
Beginning balance (223) (384) (154) (122) (121) (123)
Net other comprehensive income (loss) (1,658) 161 (230) (83) (1) 2
Ending balance (1,881) (223) (384) (205) (122) (121)
Total Accumulated Other Comprehensive Income (Loss) [Member]            
Accumulated Other Comprehensive Income Loss [Line Items]            
Beginning balance 329 1,010 (154) (122) (121) (123)
Ending balance $ (1,759) $ 329 $ 1,010 $ (205) $ (122) $ (121)