Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets, Net - Additional Information (Detail)

v3.19.2
Intangible Assets, Net - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Intangible Assets Net Excluding Goodwill [Abstract]          
Amortization expenses of intangible assets $ 347 $ 420 $ 695 $ 845 $ 1,685