Stock-Based Compensation - Restricted Stock Activity (Details) $ / shares in Units, $ in Millions	3 Months Ended
Mar. 31, 2020 USD ($) $ / shares shares
Restricted Stock Activity, Weighted-Average Grant Date Fair Value
Unrecognized compensation expense \| $	$ 5.1
Weighted average remaining period over which unrecognized compensation expense will be recognized	2 years 6 months
Restricted stock units
Restricted Stock Activity, Number of Shares
Nonvested shares, Beginning Balance \| shares	193,625
Granted \| shares	237,675
Cancelled \| shares	(6,688)
Vested \| shares	(48,402)
Nonvested shares, Ending Balance \| shares	376,210
Restricted Stock Activity, Weighted-Average Grant Date Fair Value
Nonvested shares, Weighted Average Grant Date Fair Value, Beginning Balance \| $ / shares	$ 3.14
Granted, Weighted-Average Grant Date Fair Value \| $ / shares	1.79
Cancelled, Weighted-Average Grant Date Fair Value \| $ / shares	2.34
Vested, Weighted-Average Grant Date Fair Value \| $ / shares	3.14
Nonvested shares, Weighted Average Grant Date Fair Value, Ending Balance \| $ / shares	$ 2.30
Unrecognized compensation expense \| $	$ 0.8
Weighted average remaining period over which unrecognized compensation expense will be recognized	3 years 3 months 18 days

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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- Definition

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

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- Definition

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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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.

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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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- 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.

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