Aggregate number of common shares reserved for future issuance.

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Amount of cash inflow 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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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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The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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

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Maximum number of shares that may be issued in accordance with the plan as a proportion of outstanding capital stock.

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Purchase price of common stock expressed as a percentage of its fair value.

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Number of shares issued during the period as a result of an employee stock purchase plan.

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Stock-Based Compensation - Additional Information (Details) - USD ($)	1 Months Ended	12 Months Ended		52 Months Ended
	Sep. 30, 2018	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2022	Mar. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserve for issuance		1,150,669		1,150,669
Stock-based compensation		$ 447,000	$ 2,237,000
Stock Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares granted		0	0
Stock-based compensation		$ 5,000	$ 100,000
2018 Stock Compensation Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserve for issuance		8,552		8,552
Maximum annual increase of outstanding stock reserved for future issuance, Percentage		5.00%
Number of shares available for grant under the plan		1,305		1,305
2020 Inducement Equity Incentive Plan (the "2020 plan") [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserve for issuance		181		181	640
2018 Employee Stock Purchase Plan (ESPP) [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserve for issuance	237	0		0
Maximum annual increase of outstanding stock reserved for future issuance, Percentage	1.25%
Eligible employees withhold percentage of earnings to purchase shares of common stock	15.00%
Percentage of fair market value of share of common stock to purchase	85.00%
Shares issued under employee stock purchase plan				950
Cash received from the exercise of purchase rights		$ 5,000	$ 100,000