Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Line Items]
Increase (decrease) in valuation allowance	$ 700
Net operating loss carryforwards	115,200
Tax credits carried forward			$ 500
Cash held by foreign subsidiaries	39,500
Foreign earnings repatriated	19,400
Foreign withholding tax incurred	1,000
Additional amount repatriated	12,000
Deferred tax liabilities	800
Unrecognized tax benefits liability	908	$ 894	$ 811	$ 1,098
Accrued interest and penalties are included in the unrecognized tax benefits	$ 400	$ 300
Minimum
Income Tax Disclosure [Line Items]
Federal research and development tax credit carryforward expiration year	2025
Maximum
Income Tax Disclosure [Line Items]
Federal research and development tax credit carryforward expiration year	2039
Research And Development
Income Tax Disclosure [Line Items]
Tax credits carried forward	$ 1,300
Foreign Tax Authority
Income Tax Disclosure [Line Items]
Increase (decrease) in valuation allowance	(3,400)
Net operating loss carryforwards	55,200
Tax credits carried forward	2,500
State and Local Jurisdiction
Income Tax Disclosure [Line Items]
Net operating loss carryforwards	$ 60,000