Stockholders' Deficit and Warrants - Summary of Activity for Warrants Outstanding (Details) - $ / shares	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Class Of Warrant Or Right [Line Items]
Number of Warrants, Outstanding	11,087,708	8,856,255
Number of Warrants, Exercisable	11,087,708	8,522,922
Weighted Average Exercise Price, Outstanding	$ 2.37	$ 2.91
Weighted Average Exercise Price, Exercisable	$ 2.37	$ 2.91
Weighted Average Remaining Contractual Term, Outstanding	7 years 1 month 6 days	7 years 4 months 24 days
Restatement Adjustment [Member]
Class Of Warrant Or Right [Line Items]
Number of Warrants, Outstanding	16,022,000	16,022,000
Number of Warrants, Exercisable	16,022,000	16,022,000
Weighted Average Exercise Price, Outstanding	$ 0.52	$ 0.52
Weighted Average Exercise Price, Exercisable	$ 0.52	$ 0.52
Weighted Average Remaining Contractual Term, Outstanding	5 years 1 month 6 days	5 years 9 months 18 days