Income Taxes - Research and Development Tax Credit Carryforwards (Details) - Dec. 31, 2019 - Research and Development Tax Incentive $ in Millions, $ in Millions	AUD ($)	USD ($)
State
Tax credit carryforwards
Tax credit carryforwards available to reduce future income taxes		$ 3.3
Federal
Tax credit carryforwards
Tax credit carryforwards available to reduce future income taxes		6.6
Australian
Tax credit carryforwards
Tax credit carryforwards available to reduce future income taxes	$ 3.5	$ 2.5