Stock-Based Compensation - Additional Information (Details) - USD ($)	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation	$ 102,000	$ 71,000
Unrecognized compensation costs related to non-vested stock options	$ 55,000
Period over which compensation costs related to non-vested stock options recognize	2 years
Tax benefit from recording non-cash expense relates to options granted to employees	$ 0
Restricted Stock Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of restricted stock units granted	0	0
Restricted stock units vested	0
Stock-based compensation	$ 70,000	$ 31,000
Unrecognized compensation costs related to non-vested stock options	181,000
Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation	$ 32,000	$ 40,000
Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of options granted	0	0

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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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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Amount of tax benefit from exercise of option under share-based payment arrangement.

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Amount of noncash expense for share-based payment arrangement.

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

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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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Net number of share options (or share units) granted during the period.

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