Mezzanine and Stockholders' Equity - Stock Option Activity Under Black-Scholes Option (Details)	9 Months Ended
Sep. 30, 2019 $ / shares
Board Members
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected Term	3 years
Expected volatility	100.27%
Risk-free interest rate	2.51%
Market value of common stock (in dollars per share)	$ 18.11
Annual dividend yield	0.00%
Forfeiture rate	0.00%
Executives
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected Term	4 years
Expected volatility	91.04%
Risk-free interest rate	1.55%
Market value of common stock (in dollars per share)	$ 17.62
Annual dividend yield	0.00%
Forfeiture rate	0.00%

Represents the forfeiture rate.

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

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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

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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.

+ References

No definition available.

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- Definition

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

+ References

No definition available.

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- Definition

Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the 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
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