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Stock-Based Compensation - Options Granted, Assumptions and Weighted Average Fair Value (Details) - Stock Option - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of options granted during the year	$ 1,066	$ 50	$ 143
Weighted average fair value of grants (in usd per share)	$ 3.56	$ 3.48	$ 6.50
Risk-free interest rate (as a percent)	1.61%	2.13%	2.66%
Expected dividend yield (as a percent)	0.00%	0.00%	0.00%
Expected forfeiture rate (as a percent)	0.00%	0.00%	0.00%
Expected volatility (as a percent)	55.33%	43.60%	52.68%
Expected term in years	5 years 1 month 9 days	6 years 6 months	3 years 8 months 15 days

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- Definition

Share Based Comp expected forfeiture rate

+ References

No definition available.

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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.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(iii)
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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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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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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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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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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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Value, after forfeiture, of shares granted under share-based payment arrangement. Excludes employee stock ownership plan (ESOP).

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