Employee Compensation and Benefit Plans - Schedule of Assumptions used to Value Stock Awards Granted (Details) - $ / shares	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Monte Carlo [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate, minimum (percentage)	1.16%	1.15%	1.12%
Risk-free interest rate, maximum (percentage)	2.40%	1.18%	1.18%
Expected stock price volatility, minimum (percentage)	73.00%	71.00%	71.00%
Expected stock price volatility, maximum (percentage)	76.00%	74.00%	77.00%
Black Scholes [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate (percentage)	2.60%
Risk-free interest rate, minimum (percentage)		2.79%
Risk-free interest rate, maximum (percentage)		3.14%
Expected stock price volatility (percentage)	68.00%	67.00%
Expected option life (in years)	8 years 6 months	8 years 6 months
Minimum \| Monte Carlo [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value (USD per share)	$ 1.75	$ 1.84	$ 2
Minimum \| Black Scholes [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value (USD per share)	1.37	2.00
Maximum \| Monte Carlo [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value (USD per share)	2.25	4.80	$ 4.80
Maximum \| Black Scholes [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value (USD per share)	$ 1.55	$ 3.36

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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- Definition

The estimated measure of the maximum 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

No definition available.

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The estimated measure of the minimum 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

No definition available.

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

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

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No definition available.

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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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No definition available.

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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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- Definition

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

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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.

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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
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