Amount expected to be recognized in earnings for the specified restructuring cost.

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The number of positions eliminated during the period as a result of restructuring activities.

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The number of positions eliminated during the period as a percentage of total positions eliminated during the period in connection with the restructuring plan(s).

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Subsequent Events (Details) - Subsequent Event - Elimination of portion of Company's workforce $ in Millions		3 Months Ended		12 Months Ended
	Jul. 31, 2017 USD ($) position	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2018 USD ($)
Subsequent Events
Number of positions eliminated \| position	26
Percentage of workforce eliminated	19.00%
Expected restructuring costs	$ 1.5
Forecast
Subsequent Events
Restructuring costs		$ 0.4	$ 0.9	$ 0.2