Stockholders' Equity - Inducement Plan - Stock Option Activity (Details) - $ / shares	6 Months Ended	12 Months Ended
Jun. 30, 2022	Dec. 31, 2021
OUTSTANDING OPTIONS
Options forfeited	(73,859)
WEIGHTED-AVERAGE EXERCISE PRICE
Options forfeited	$ 1.98
Inducement Plan
OUTSTANDING OPTIONS
Outstanding at beginning of period	1,813,600
Options granted	335,000
Options forfeited	(7,116)
Outstanding at end of period	2,141,484	1,813,600
WEIGHTED-AVERAGE EXERCISE PRICE
Outstanding at beginning of period	$ 2.08
Options granted	1.13
Options forfeited	3.69
Outstanding at end of period	$ 1.92	$ 2.08
VESTED AND EXPECTED TO VEST
Outstanding options	1,557,284
Weighted-Average Exercise Price	$ 1.91
ADDITIONAL DISCLOSURES
Outstanding options exercisable at end of period	29,501
Weighted-average exercise price exercisable at end of period	$ 3.59
Weighted-average contractual term outstanding	9 years 2 months 12 days	9 years 7 months 6 days
Weighted-average contractual term (years) exercisable	6 years 8 months 12 days

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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