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Stockholders' Equity - Stock-Based Compensation Expense (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Stock-based compensation expense
Total stock-based compensation expense	$ 1,562,161	$ 1,761,673	$ 3,176,346	$ 3,583,822
Research and Development
Stock-based compensation expense
Total stock-based compensation expense	609,321	747,006	1,298,294	1,483,037
General and Administrative Expense.
Stock-based compensation expense
Total stock-based compensation expense	$ 952,840	$ 1,014,667	$ 1,878,052	$ 2,100,785

X

- Definition

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

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