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The Company and Summary of Significant Accounting Policies (Details Textual)	2 Months Ended	12 Months Ended
	Feb. 22, 2021 USD ($)	Dec. 31, 2020 USD ($) Segment	Dec. 31, 2019 USD ($)
Company And Summary Of Significant Accounting Policies Table [Line Items]
Revenues		$ 0
Proceeds from the issuance of common stock		50,894,000	$ 7,281,000
Concentrations of credit risk		$ 0
Number of segments | Segment		1
2020 Sales Agreement
Company And Summary Of Significant Accounting Policies Table [Line Items]
Proceeds from the issuance of common stock		$ 28,900,000
2020 Sales Agreement | Subsequent Event
Company And Summary Of Significant Accounting Policies Table [Line Items]
Proceeds from the issuance of common stock	$ 23,300,000

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Company and summary of significant accounting policies.

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The fair value of financial assets, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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The cash inflow from the additional capital contribution to the entity.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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