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Stock-Based Compensation - Warrant Activity (Details) - Warrants [Member] - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Number of Shares
Outstanding - Beginning Balance	1,001,028	2,049,534
Exercised	(963,149)	(1,027,546)
Expired	(37,879)	(20,960)
Outstanding - Ending Balance		1,001,028
Weighted-Average Exercise Price/Share
Outstanding - Beginning Balance	$ 3.83	$ 4.03
Exercised	3.80	3.95
Expired	$ 4.58	17.78
Outstanding - Ending Balance		$ 3.83
Weighted-Average Remaining Contractual Term (Years)
Outstanding - December 31, 2021	0 years
Vested (exercisable)	0 years

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for fully vested and expected to vest exercisable or convertible options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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