Australia Research and Development Tax Incentive (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Tax Credit Carryforward [Line Items]
Research and development tax incentive credit received during the period	$ 200,000	$ 1,500,000
Australian tax incentive receivable	$ 0	$ 174,000
Australian Taxation Office | Subsidiaries
Tax Credit Carryforward [Line Items]
Refundable tax incentive for qualified research and development activities	43.50%	43.50%	43.50%
Research and development	$ 0.0	$ 100,000	$ 1,500,000