Income Taxes - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Line Items]
Income tax examination, likelihood of unfavorable settlement	greater than 50 percent
Uncertain tax positions	$ 2,731,015	$ 1,538,220
Accrued interest or penalties	0	0
Recognized interest or penalties	0	0
Valuation allowance	43,350,682	38,740,784
Change in valuation reserve	4,609,898
Gross unrecognized tax benefits	2,731,015	$ 1,538,220
Unrecognized tax benefits if recognized would impact effective tax rate	0
Research and Experimental Tax Credits
Income Tax Disclosure [Line Items]
Gross unrecognized tax benefits	2,731,015
Federal
Income Tax Disclosure [Line Items]
NOL carryforwards	158,175,977
State
Income Tax Disclosure [Line Items]
NOL carryforwards	106,182,477
With Expiration | Federal
Income Tax Disclosure [Line Items]
NOL carryforwards	$ 121,776,595
Beginning Expiration Year | Federal
Income Tax Disclosure [Line Items]
NOL carryforward expiration year	2021
Tax credit carryforward, expiration year	2021
Beginning Expiration Year | State
Income Tax Disclosure [Line Items]
NOL carryforward expiration year	2027
Tax credit carryforward, expiration year	2020
Ending Expiration Year | Federal
Income Tax Disclosure [Line Items]
NOL carryforward expiration year	2037
Ending Expiration Year | State
Income Tax Disclosure [Line Items]
NOL carryforward expiration year	2039
Without Expiration | Federal
Income Tax Disclosure [Line Items]
NOL carryforwards	$ 36,399,382