Revenue From Contracts With Customers - Deferred Sublicense Payments (Details) - USD ($)	Sep. 30, 2019	Dec. 31, 2018
Current and long-term prepaid expenses
Revenue From Contracts With Customers
Deferred sublicense payments	$ 0	$ 0
Other assets, net
Revenue From Contracts With Customers
Deferred sublicense payments	$ 0	$ 807,192

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