Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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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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-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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-Paragraph 2
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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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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=109197908&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 - 2010 Plan (Details) - shares	12 Months Ended
Stock Plans - 2010 Plan (Details) - shares	Dec. 31, 2018	Dec. 31, 2013	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based compensation
Number of options outstanding (in shares)	1,222,000		1,394,000	1,576,000	2,064,000
Inducement Plan
Share-based compensation
Common stock available for grant (in shares)		0
2010 Stock Incentive Plan
Share-based compensation
Number of shares authorized	10,600,000
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 \| 2010 Stock Incentive Plan
Share-based compensation
Vesting period	3 years
Number of options outstanding (in shares)	1,200,000
Stock options \| 2010 Stock Incentive Plan \| Minimum
Share-based compensation
Expiration term	7 years
Stock options \| 2010 Stock Incentive Plan \| Maximum
Share-based compensation
Expiration term	10 years
Restricted stock awards and restricted stock units \| 2010 Stock Incentive Plan \| Minimum
Share-based compensation
Vesting period	1 year
Restricted stock awards and restricted stock units \| 2010 Stock Incentive 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 \| 2010 Stock Incentive Plan
Share-based compensation
Number of awards outstanding (in shares)	900,000