Summary of Significant Accounting Policies - Incentive and Tax Receivable (Details) - USD ($)	3 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Incentive and Tax Receivable
Total incentive and tax receivables		$ 14,613,969	$ 3,444,620
Australian Taxation Office
Incentive and Tax Receivable
Aggregate revenue maximum to be eligible to receive a cash refund		20,000,000
Research and development incentive and tax receivable	$ 8,300,000	8,300,000
Research and development incentive tax credit	$ 8,300,000	8,300,000
Research and development incentive for the period 1/1/18 - 12/31/18		3,126,750	3,149,546
Research and development incentive (non-AOF) for the period 1/1/19 - 12/31/19		2,913,417
Research and development incentive (AOF) for the period 1/1/18 - 12/31/19		8,256,416
Goods and services tax		317,386	295,074
Total incentive and tax receivables		14,613,969	$ 3,444,620
Incentive and tax receivables current | Australian Taxation Office
Incentive and Tax Receivable
Cash refund from research and development incentive program		6,000,000
Estimated GST receivable		$ 300,000