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Summary of Stock Option Activity (Details)	3 Months Ended
	Mar. 31, 2020 $ / shares shares
Stock Options Outstanding
Stock Options Outstanding, Beginning of year | shares	3,126,521
Stock Options Outstanding, Exercised | shares	(40,000)
Stock Options Outstanding, Cancelled | shares	(5,312)
Stock Options Outstanding, Expired | shares	(146,972)
Stock Options Outstanding, End of year | shares	2,934,237
Stock Options Outstanding, Exercisable | shares	2,653,323
Weighted-Average Exercise Price
Weighted-Average Exercise Price, beginning of year | $ / shares	$ 11.61
Weighted Average Exercise Price, Exercised | $ / shares	2.07
Weighted Average Exercise Price, Cancelled | $ / shares	12.88
Weighted Average Exercise Price, Expired | $ / shares	26.70
Weighted-Average Exercise Price, end of year | $ / shares	10.99
Weighted Average Exercise Price, Exercisable | $ / shares	$ 10.76

X

- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iii)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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- Definition

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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- Definition

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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Number of non-vested options outstanding.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Number of non-vested options forfeited.

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Weighted average grant-date fair value of non-vested options forfeited.

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Number of share options (or share units) exercised during the current period.

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