Income Taxes - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Income Tax Contingency [Line Items]
Deferred tax assets, state NOLs	$ 500
Deferred tax assets, federal NOLs	100
Valuation allowance	7,308	$ 7,172
Liability for unrecognized tax benefits	7,700
Threshold to favorably impact effective tax rate	7,700
Unrecognized tax benefits, accrued interest	200	$ 200
UNITED KINGDOM
Income Tax Contingency [Line Items]
Deferred tax assets, foreign NOLs	6,000
Valuation allowance	1,300
CANADA
Income Tax Contingency [Line Items]
Deferred tax assets, foreign NOLs	1,000
Valuation allowance	300
Australia
Income Tax Contingency [Line Items]
Deferred tax assets, foreign NOLs	1,300
Federal
Income Tax Contingency [Line Items]
Federal research and development credit carry forwards	100
State Tax | ARIZONA
Income Tax Contingency [Line Items]
State research and development credit carry forwards	$ 11,600