Stock-Based Compensation - Summary of Unvested Award Activity (Details)	6 Months Ended
Jun. 30, 2020 $ / shares shares
Restricted Stock Units
Shares
Unvested at beginning period (in shares) \| shares	1,107,796
Granted (in shares) \| shares	568,900
Vested (in shares) \| shares	(530,738)
Unvested at end period (in shares) \| shares	1,145,958
Weighted-Average Grant Date Fair Value
Unvested at beginning of period, Weighted-Average Grant Date Fair Value (in dollars per share) \| $ / shares	$ 6.60
Granted, Weighted-Average Grant Date Fair Value (in dollars per share) \| $ / shares	5.15
Vested, Weighted-Average Grant Date Fair Value (in dollars per share) \| $ / shares	6.53
Unvested at end of period, Weighted-Average Grant Date Fair Value (in dollars per share) \| $ / shares	$ 5.91
Performance Stock Units
Shares
Unvested at beginning period (in shares) \| shares	835,625
Granted (in shares) \| shares	1,043,800
Unvested at end period (in shares) \| shares	1,879,425
Weighted-Average Grant Date Fair Value
Unvested at beginning of period, Weighted-Average Grant Date Fair Value (in dollars per share) \| $ / shares	$ 10.51
Granted, Weighted-Average Grant Date Fair Value (in dollars per share) \| $ / shares	5.36
Unvested at end of period, Weighted-Average Grant Date Fair Value (in dollars per share) \| $ / shares	$ 7.65

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).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

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).

+ References

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- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 2
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