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Income Taxes - Loss Carryforwards (Details) $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($)
Net operating loss carry forwards
Period for measuring the change in ownership	3 years
Maximum change in ownership percentage allowed before statutory limitations imposed on the availability of net operating losses	50.00%
Tax benefit associated with exercise of stock options to be recorded in additional paid-in capital on recognition of associated NOL	$ 4.6
Federal
Net operating loss carry forwards
Amount of net operating loss carry forwards	637.0
Writedown of NOL's and R&D credits subject to Section 382 limitation	0.0
Foreign
Net operating loss carry forwards
Amount of net operating loss carry forwards	40.0
State
Net operating loss carry forwards
Amount of net operating loss carry forwards	$ 623.0

X

- Definition

The limitation imposed by Section 382 related to the use of all operating loss carryforwards available to reduce future taxable income in the event of a more than specified percentage change in ownership.

+ References

No definition available.

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- Definition

Represents the period over which the basis percentage increase in the shareholders' equity is measured for the purpose of calculating the ownership change as defined in section 382 of the Internal Revenue Code of 1986, as amended, which will affect the ability of the entity to utilize its net operating loss carry forwards.

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- Definition

Writedown to net realizable value of the federal NOL's and research and development credits subject to Section 382 limitations.

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- Definition

Amount of increase in additional paid in capital (APIC) resulting from a tax benefit associated with share-based compensation plan other than an employee stock ownership plan (ESOP). Includes, but is not limited to, excess tax benefit.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 740
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6419406&loc=d3e23524-113945

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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