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Organization and Description of Business (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Organization and Description of Business
Cash and cash equivalents	$ 5,328	$ 6,451
Short-term held-to-maturity investments	3,161	2,606
Gross proceeds to date	91,000
Accumulated deficit	$ (89,952)	$ (88,523)

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The gross proceeds from issuance of stock under the program from inception to the balance sheet date.

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Amount 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. Excludes cash and cash equivalents within disposal group and discontinued operation.

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