Income Taxes - Summary of Supplemental Balance Sheet Information Related to Deferred Tax Assets (Detail) $ in Thousands	Sep. 30, 2019 USD ($)
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets	$ 49,405
Valuation Allowance	(42,913)
Deferred Tax Assets, net	6,492
Domestic [Member]
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets	40,496
Valuation Allowance	(40,496)
International [Member]
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets	8,909
Valuation Allowance	(2,417)
Deferred Tax Assets, net	$ 6,492