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Debt and Credit Arrangements - 2018 (Details) - USD ($)		9 Months Ended	12 Months Ended
	Aug. 01, 2018	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument
Loss on extinguishment of debt			$ 0	$ 0	$ 4,900,000
Senior secured revolving credit facility due November 2022 | Revolving Credit Facility
Debt Instrument
Write off of unamortized debt issuance costs					200,000
Convertible Debt | Convertible Notes, due 2018
Debt Instrument
Debt instrument stated interest rate (percent)	2.00%
Principal amount	$ 57,100,000
Repayments of debt	$ 57,100,000
Interest paid		$ 600,000
Write off of unamortized debt issuance costs				0	400,000
Loss on extinguishment of debt				$ 0	$ 4,700,000
Percentage of expired warrants (percent)			90.00%

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Contractual interest rate for funds borrowed, under the debt agreement.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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