Income Taxes - Summary of Net Operating Loss and Tax Credit Carryforwards (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
State [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, amount	$ 17,384
Tax credit carryforward, amount	$ 93,056
State [Member] | Earliest Tax Year [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, expiration year	2020
Tax credit carryforward, expiration year	2021
State [Member] | Latest Tax Year [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, expiration year	2036
Tax credit carryforward, expiration	indefinite
Foreign [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, amount	$ 13,507
Foreign [Member] | Earliest Tax Year [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, expiration year	2029
Foreign [Member] | Latest Tax Year [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, expiration	indefinite
Federal [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, amount	$ 5,991
Tax credit carryforward, amount	$ 100,462
Federal [Member] | Earliest Tax Year [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, expiration year	2030
Tax credit carryforward, expiration year	2027
Federal [Member] | Latest Tax Year [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, expiration year	2036
Tax credit carryforward, expiration year	2039