Annual report pursuant to Section 13 and 15(d)

Income Taxes - Summary of Gross Unrecognized Tax Benefits (Detail)

v3.10.0.1
Income Taxes - Summary of Gross Unrecognized Tax Benefits (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Balance at beginning of period $ 3,295 $ 2,286 $ 2,127
Increases related to prior year tax positions 6 0 0
Increases related to tax positions 1,283 1,009 159
Balance at end of period 4,584 3,295 2,286
Increases related to prior year tax positions $ 6 $ 0 $ 0