Annual report pursuant to Section 13 and 15(d)

Provision for Income Taxes - Summary of Valuation Allowance (Detail)

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Provision for Income Taxes - Summary of Valuation Allowance (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Valuation Allowance [Abstract]    
Valuation allowance, at beginning of year $ 35,233 $ 18,278
Increase in valuation allowance 13,772 16,955
Valuation allowance, at end of year $ 49,005 $ 35,233