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Basis of Presentation and Summary of Significant Accounting Policies - Fair Value Inputs (Details)	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Expected volatility	96.40%	92.90%
Expected life (in years)	6 years 2 months 12 days	6 years 2 months 12 days
Warrants
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Risk free interest rate, minimum		0.24%
Risk free interest rate, maximum		0.26%
Warrants | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Expected volatility		100.17%
Expected life (in years)		4 years 14 days
Warrants | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Expected volatility		100.27%
Expected life (in years)		4 years 6 months 14 days

X

- 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

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- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ 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 (f)(2)(ii)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

The maximum risk-free interest rate assumption that is used in valuing an option on its own shares.

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The minimum risk-free interest rate assumption that is used in valuing an option on its own shares.

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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-Section S99
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-Subparagraph (SAB Topic 14.D.2)
-URI http://asc.fasb.org/extlink&oid=122041274&loc=d3e301413-122809

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