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Stock-Based Compensation - Warrant Activity (Details) - Warrants [Member] - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Number of Shares
Outstanding	1,001,028	2,049,534
Issued	0		0
Exercised	(963,149)	(1,027,546)
Expired	(37,879)	(20,960)
Outstanding		1,001,028	2,049,534
Weighted-Average Exercise Price/Share
Outstanding	$ 3.83	$ 4.03
Issued	0		$ 0
Exercised	3.80	3.95
Expired	$ 4.58	17.78
Outstanding		$ 3.83	$ 4.03
Weighted-Average Remaining Contractual Term (Years)
Outstanding	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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Gross number of share options (or share units) granted during the period.

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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 price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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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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