Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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No definition available.

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Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Net number of share options (or share units) granted during the period.

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

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-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Stock Plans - 2019 Plan (Details) - shares	12 Months Ended
Stock Plans - 2019 Plan (Details) - shares	Dec. 31, 2019	Dec. 31, 2013	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based compensation
Number of options outstanding (in shares)	1,119,000		1,222,000	1,394,000	1,576,000
Inducement Plan
Share-based compensation
Common stock available for grant (in shares)		0
2019 Plan
Share-based compensation
Number of shares authorized	13,300,000
Stock options \| Inducement Plan
Share-based compensation
Awards granted (in shares)		124,500
Vesting period		3 years
Expiration term		10 years
Number of options outstanding (in shares)	2,000
Stock options \| 2019 Plan
Share-based compensation
Vesting period	3 years
Number of options outstanding (in shares)			1,100,000
Stock options \| 2019 Plan \| Minimum
Share-based compensation
Expiration term	7 years
Stock options \| 2019 Plan \| Maximum
Share-based compensation
Expiration term	10 years
Restricted stock awards and restricted stock units \| 2019 Plan \| Minimum
Share-based compensation
Vesting period	1 year
Restricted stock awards and restricted stock units \| 2019 Plan \| Maximum
Share-based compensation
Vesting period	5 years
Restricted stock units \| Inducement Plan
Share-based compensation
Awards granted (in shares)		87,000
Number of awards outstanding (in shares)	0
Restricted stock units \| Inducement Plan \| Minimum
Share-based compensation
Vesting period		2 years
Restricted stock units \| Inducement Plan \| Maximum
Share-based compensation
Vesting period		4 years
RSUs and PSUs \| 2019 Plan
Share-based compensation
Number of awards outstanding (in shares)	900,000