Proceeds from At the time market offering net of commission and fees.

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Proceeds from sale of common stock net commission paid.

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Summary of significant accounting policies.

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Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

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The cash inflow associated with the amount received from entity's first offering of stock to the public.

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Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

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Number of new stock issued during the period.

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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Summary Of Significant Accounting Policies [Line Items]
Proceeds from ATM offering, net of sales agent commission and fees			$ 16,598,000	$ 10,357,000
Useful life of trademark			15 years
Cash equivalents	$ 52,485,000		$ 52,485,000		$ 52,509,000
General and Administrative Expense
Summary Of Significant Accounting Policies [Line Items]
Patent expenses	564,000,000	$ 564,000	$ 1,230,000,000	$ 1,083,000
Type of Cost, Good or Service [Extensible List]			us-gaap:LicenseMember	us-gaap:LicenseMember
Trademarks
Summary Of Significant Accounting Policies [Line Items]
Amortization of intangible assets	3,000,000	$ 6,000,000	$ 3,000,000	$ 6,000,000
Certificate of Deposit
Summary Of Significant Accounting Policies [Line Items]
Restricted cash used to collateralize a credit card	$ 150,000		150,000		$ 150,000
Stifel Nicolaus and Company Inc. \| Sales Agreement March 2020 \| Maximum
Summary Of Significant Accounting Policies [Line Items]
Proceeds from Issuance Initial Public Offering			40,000,000
Stifel Nicolaus and Company Inc. \| Sales Agreement March 2020 \| Transaction Expense
Summary Of Significant Accounting Policies [Line Items]
Proceeds from sale of common stock			$ 32,700,000
Stifel Nicolaus and Company Inc. \| Sales Agreement June 2020 \| Transaction Expense
Summary Of Significant Accounting Policies [Line Items]
Sale of common stock, number of shares			2,099,700
Jefferies LLC [Member] \| October 2021 ATM Agreement \| Maximum
Summary Of Significant Accounting Policies [Line Items]
Proceeds from Issuance Initial Public Offering			$ 80,000,000
Jefferies LLC [Member] \| October 2021 ATM Agreement \| Transaction Expense
Summary Of Significant Accounting Policies [Line Items]
Stock Issued During Period, Shares, New Issues	1,197,394		3,117,220
Proceeds from sale of common stock	$ 80,000,000		$ 80,000,000
Sale of common stock, number of shares			3,593,407
Proceeds from sale of common stock	$ 5,982,000		$ 16,598,000
Jefferies LLC [Member] \| October 2021 ATM Agreement \| Transaction Expense \| Maximum
Summary Of Significant Accounting Policies [Line Items]
Proceeds from sale of common stock			$ 23,600