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Stock-based Compensation - Stock Option Activity (Details) - $ / shares	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Options [Roll Forward]
Balance as of December 31, 2021 (in shares)	1,170,873	1,170,890
Cancelled/forfeited (in shares)	(17)
Vested and expected to vest at March 31, 2022 (in shares)	460,217
Exercisable at March 31, 2022 (in shares)	1,102,117
Weighted Average Exercise Price [Roll Forward]
Balance as of December 31, 2021 (in dollars per share)	$ 4.65	$ 5.01
Cancelled/forfeited (in dollars per share)	24,706.00
Vested and expected to vest at March 31, 2022 (in dollars per share)	8.04
Exercisable at March 31, 2022 (in dollars per share)	$ 4.74
Weighted Average Remaining Contractual Life (years) [Roll Forward]
Balance as of December 31, 2021	8 years 9 months	9 years
Vested and expected to vest at March 31, 2022	8 years 5 months 19 days
Exercisable at March 31, 2022	8 years 8 months 23 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 weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock 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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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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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest exercisable or convertible options. 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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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 price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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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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