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Stockholders' Equity - Stock-Based Compensation Expense (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Stock-based compensation expense
Total stock-based compensation expense	$ 1,690,351	$ 1,587,147	$ 5,274,173	$ 4,488,985
Research and Development
Stock-based compensation expense
Total stock-based compensation expense	763,081	610,506	2,246,118	1,697,171
General and Administrative Expense.
Stock-based compensation expense
Total stock-based compensation expense	$ 927,270	$ 976,641	$ 3,028,055	$ 2,791,814

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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