Share-Based Compensation - Schedule of SAR Assumptions (Details) - $ / shares		12 Months Ended
Jul. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Aug. 08, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated dividend yield		0.00%	0.00%
Expected volatility		102.14%	81.73%
Risk-free interest rate		1.87%	2.75%
Expected term (in years)		5 years 2 months 12 days	5 years 8 months 5 days
SARs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated dividend yield	0.00%		0.00%
Expected volatility	115.82%		86.71%
Risk-free interest rate	2.07%		2.63%
Expected term (in years)	6 months 4 days		1 year 1 month 2 days
Fair value per share of common stock underlying the instrument (in USD per share)	$ 2.66		$ 0.83
SAR exercise price (in USD per share)	$ 3.8		$ 3.8	$ 3.8

Agreed-upon price for the exchange of the underlying asset relating to the share-based payment award.

No definition available.

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- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ References

+ Details

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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.

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+ Details

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- Definition

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

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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.

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No definition available.

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- Definition

Price of a single share of a number of saleable stocks of a company.

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No definition available.

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- Definition

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.

+ 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)(i)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.D.2)
-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

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