Stock-Based Compensation - Restricted Stock Unit Grants (Details) - RSU's - 2018 Plan - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2020	Dec. 31, 2019
Number of Shares
Balance at the beginning of the period (in shares)	309,305
Balance at the end of the period (in shares)	309,305	309,305
Weighted Average Grant Date Fair Value
Balance at the beginning of the period	$ 1.99
Balance at the end of the period	$ 1.99	$ 1.99
Average Remaining Contractual Life (Years)
Weighted average remaining contractual life (in years)	11 months 9 days	1 year 2 months 9 days
Aggregate Intrinsic Value
Aggregate intrinsic value outstanding	$ 616	$ 616
Minimum
Stock-Based Compensation
Vesting period	1 year
Maximum
Stock-Based Compensation
Vesting period	2 years

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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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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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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

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