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Stock-Based Compensation - Summary of RSU Activity Under Plans (Details) - Equity Incentive Plan 2019 - RSU's shares in Thousands	3 Months Ended
	Mar. 31, 2021 $ / shares shares
Number of Shares
Non-vested shares at the beginning of the year | shares	65
Granted (in shares) | shares	10
Vested (in shares) | shares	(17)
Non-vested shares at the end of the period | shares	58
Weighted Average Grant-Date Fair Value
Weighted average grant date fair value | $ / shares	$ 3.48
Granted (in dollars per share) | $ / shares	3.25
Vested (in dollars per share) | $ / shares	3.78
Weighted average grant date fair value | $ / shares	$ 3.35

X

- Definition

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).

+ References

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-Publisher FASB
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-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
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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).

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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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