Share Based Compensation - Summary of Awards (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restricted Stock
Number of Shares
Unvested shares/units outstanding at beginning of period (in shares)	233	365
Granted (in shares)	105	93
Vested (in shares)	(174)	(210)
Forfeited / Canceled (in shares)	(50)	(15)
Unvested shares/units outstanding at end of period (in shares)	114	233
Weighted- Average Grant Date Fair Value (usd per share)
Unvested shares/units outstanding (in usd per share)	$ 3.26	$ 12.66	$ 16.07
Granted (in usd per share)	2.15	8.06
Vested (in usd per share)	11.53	16.29
Forfeited / Canceled (in usd per share)	$ 15.97	$ 16.25
Aggregate intrinsic value of award vested during period	$ 0.2
Restricted Stock Units
Number of Shares
Unvested shares/units outstanding at beginning of period (in shares)	0
Granted (in shares)	1,410
Unvested shares/units outstanding at end of period (in shares)	1,410	0
Weighted- Average Grant Date Fair Value (usd per share)
Unvested shares/units outstanding (in usd per share)	$ 1.10	$ 0
Granted (in usd per share)	$ 1.10
Performance Share Units
Number of Shares
Unvested shares/units outstanding at beginning of period (in shares)	92	111
Granted (in shares)	205
Vested (in shares)	(92)	(19)
Unvested shares/units outstanding at end of period (in shares)	205	92
Weighted- Average Grant Date Fair Value (usd per share)
Unvested shares/units outstanding (in usd per share)	$ 1.66	$ 20.41	$ 20.41
Granted (in usd per share)	1.66
Vested (in usd per share)	$ 20.41	$ 15.11
Aggregate intrinsic value of award vested during period	$ 0.1

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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-Name Accounting Standards Codification
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-Section 50
-Paragraph 2
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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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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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The weighted average fair value at grant date for nonvested equity-based awards issued 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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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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Intrinsic value of vested award under share-based payment arrangement. Excludes share and unit options.

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