Annual report pursuant to Section 13 and 15(d)

Valuation Allowance of Deferred Tax Assets (Detail)

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Valuation Allowance of Deferred Tax Assets (Detail) - Valuation Allowance of Deferred Tax Assets - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Valuation and Qualifying Accounts Disclosure [Line Items]      
Beginning Balance $ 54,725 $ 35,246 $ 14,524
Additions 7,611 22,005 21,347
Deductions (1,977) (2,526) (625)
Ending Balance $ 60,359 $ 54,725 $ 35,246