Stockholders' Deficit and Warrants (Tables)

12 Months Ended

Dec. 31, 2021

Equity [Abstract]

Summary of Activity for Warrants Outstanding

The following table summarizes such warrants outstanding and exercisable as of December 31, 2021 and 2020 that are liability-classified.

	Number of Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term
December 31, 2021:
Outstanding		16,022,000	$	0.52		4.8
Exercisable		16,022,000	$	0.52
December 31, 2020:
Outstanding		16,022,000	$	0.52		5.8
Exercisable		16,022,000	$	0.52

In addition to the issuance of the aforementioned liability-classified warrants, the Company has issued warrants with different terms that are considered indexed to the Company's common stock and, therefore, are classified in additional paid-in capital and are not required to be measured at fair value at each reporting date. The following table summarizes such equity-classified warrants outstanding and exercisable as of December 31, 2021 and 2020 and is inclusive of the warrants disclosed in Note 8, Stock-Based Compensation, that are equity-classified:

	Number of Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term
December 31, 2021:
Outstanding		11,087,708	$	2.37		6.9
Exercisable		11,087,708	$	2.37
December 31, 2020:
Outstanding		8,856,255	$	2.91		7.4
Exercisable		8,522,922	$	2.91