Stock-Based Compensation - Restricted Stock Activity (Details)	9 Months Ended
Sep. 30, 2020 $ / shares shares
Restricted stock
Shares
Number, beginning balance (in shares) \| shares	62,817
Number, granted (in shares) \| shares	0
Number, vested and converted (in shares) \| shares	(16,767)
Number, forfeited (in shares) \| shares	(5,716)
Number, ending balance (in shares) \| shares	40,334
Weighted Average Grant-Date Fair Value Per Share
Weighted average grant date fair value per share, beginning balance (in dollars per share) \| $ / shares	$ 64.40
Weighted average grant date fair value per share, granted (in dollars per share) \| $ / shares	0
Weighted average grant date fair value per share, vested and converted (in dollars per share) \| $ / shares	64.40
Weighted average grant date fair value per share, forfeited (in dollars per share) \| $ / shares	64.40
Weighted average grant date fair value per share, ending balance (in dollars per share) \| $ / shares	$ 64.40
RSUs
Shares
Number, beginning balance (in shares) \| shares	44,439
Number, granted (in shares) \| shares	64,914
Number, vested and converted (in shares) \| shares	(17,392)
Number, forfeited (in shares) \| shares	(16,152)
Number, ending balance (in shares) \| shares	75,809
Weighted Average Grant-Date Fair Value Per Share
Weighted average grant date fair value per share, beginning balance (in dollars per share) \| $ / shares	$ 59.71
Weighted average grant date fair value per share, granted (in dollars per share) \| $ / shares	12.96
Weighted average grant date fair value per share, vested and converted (in dollars per share) \| $ / shares	33.06
Weighted average grant date fair value per share, forfeited (in dollars per share) \| $ / shares	19.21
Weighted average grant date fair value per share, ending balance (in dollars per share) \| $ / shares	$ 34.42
Performance-based RSUs
Shares
Number, beginning balance (in shares) \| shares	23,480
Number, granted (in shares) \| shares	24,854
Number, vested and converted (in shares) \| shares	(1,260)
Number, forfeited (in shares) \| shares	(8,515)
Number, ending balance (in shares) \| shares	38,559
Weighted Average Grant-Date Fair Value Per Share
Weighted average grant date fair value per share, beginning balance (in dollars per share) \| $ / shares	$ 33.90
Weighted average grant date fair value per share, granted (in dollars per share) \| $ / shares	12.42
Weighted average grant date fair value per share, vested and converted (in dollars per share) \| $ / shares	30.89
Weighted average grant date fair value per share, forfeited (in dollars per share) \| $ / shares	21.24
Weighted average grant date fair value per share, ending balance (in dollars per share) \| $ / shares	$ 22.95

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

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)(1)(iv)(3)
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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.

+ References

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-Publisher FASB
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-Topic 718
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-Section 50
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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).

+ References

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

+ References

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-Publisher FASB
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- Definition

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

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-Publisher FASB
-Name Accounting Standards Codification
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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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