XML 79 R57.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Unrecognized tax benefit (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]    
Beginning Balance $ 1,573 $ 1,475
Increase/(Decrease) of unrecognized tax benefits taken in prior years 45 13
Increase/(Decrease) of unrecognized tax benefits related to current year 253 85
Ending Balance $ 1,871 $ 1,573