Stockholders' Equity - Warrants Outstanding and Exercisable (Details) - $ / shares	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares outstanding (in shares)	1,172,000		1,790,000
Outstanding	6 years 2 months 1 day	6 years 1 month 2 days
Weighted average exercise price (in dollars per share)	$ 0.13		$ 0.19
Exercisable (in shares)	1,071,125
Exercisable (in dollars per share)	$ 0.14
Warrant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares outstanding (in shares)	5,527,778		5,527,778
Outstanding	4 years 4 months 17 days	4 years 7 months 13 days
Weighted average exercise price (in dollars per share)	$ 3.32		$ 3.32
Exercisable (in shares)	5,099,207
Exercisable (in dollars per share)	$ 3.34
Warrant \| Exercise price $6.60
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price (in dollars per share)	$ 6.60
Number of shares outstanding (in shares)	416,667		416,667
Outstanding	2 years 10 months 20 days
Weighted average exercise price (in dollars per share)	$ 6.60		$ 6.60
Exercisable (in shares)	416,667
Exercisable (in dollars per share)	$ 6.60
Warrant \| Exercise price $2.25
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price (in dollars per share)	$ 2.52
Number of shares outstanding (in shares)	396,825		396,825
Outstanding	2 years 8 months 12 days
Weighted average exercise price (in dollars per share)	$ 2.52		$ 2.52
Exercisable (in shares)	396,825
Exercisable (in dollars per share)	$ 2.52
Warrant \| Exercise price $3.10
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price (in dollars per share)	$ 3.10
Number of shares outstanding (in shares)	4,285,715
Outstanding	4 years 7 months 24 days
Weighted average exercise price (in dollars per share)	$ 3.10
Exercisable (in shares)	4,285,715
Exercisable (in dollars per share)	$ 3.10
Warrant \| Exercise price $3.08
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price (in dollars per share)	$ 3.09
Number of shares outstanding (in shares)	428,571		428,571
Outstanding	4 years 7 months 24 days
Weighted average exercise price (in dollars per share)	$ 3.08		$ 3.08
Exercisable (in shares)	0
Exercisable (in dollars per share)

Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Exercise Price

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iii)
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- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

+ References

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- Definition

Number of options outstanding, including both vested and non-vested options.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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