4. Commitments and Contingencies (Details)	Jun. 30, 2020 USD ($)
Future royalty payments for the year ending December 31,
2020 (remaining)	$ 2,550,000
2021	4,300,000
2022	4,300,000
2023	4,300,000
2024	4,300,000
2025	$ 4,300,000