Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Income Tax Contingency [Line Items]
Deferred tax assets, state NOLs	$ 1.2
Deferred tax assets, federal NOLs	0.8
Liability for unrecognized tax benefits	6.1
Threshold to favorably impact effective tax rate	6.2
Unrecognized tax benefits, accrued interest	0.2	$ 0.1
UNITED KINGDOM
Income Tax Contingency [Line Items]
Deferred tax assets, foreign NOLs	8.0
CANADA
Income Tax Contingency [Line Items]
Deferred tax assets, foreign NOLs	1.2
GERMANY
Income Tax Contingency [Line Items]
Deferred tax assets, foreign NOLs	1.4
Federal
Income Tax Contingency [Line Items]
Federal research and development credit carry forwards	0.1
State
Income Tax Contingency [Line Items]
Liability for unrecognized tax benefits	0.1
State | ARIZONA
Income Tax Contingency [Line Items]
State research and development credit carry forwards	$ 9.2