Stock Plans - stock option activity (Details) - $ / shares shares in Thousands |
12 Months Ended | |
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Dec. 31, 2021 |
Dec. 31, 2020 |
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| Stock Plans | ||
| Number of options Outstanding at December 31, 2020 | 28 | |
| Shares, Granted | 670 | |
| Shares, Cancelled | (16) | |
| Number of Options Outstanding at December 31, 2021 | 682 | 28 |
| Shares, Exercisable at December 31, 2021 | 456 | |
| Weighted Average Exercise Price, Outstanding at December 31, 2020 | $ 242.70 | |
| Weighted Average Exercise Price, Granted | 4.02 | |
| Weighted Average Exercise Price, Cancelled | 56.83 | |
| Weighted Average Exercise Price, Outstanding at December 31, 2021 | 12.53 | $ 242.70 |
| Weighted Average Exercisable at December 31, 2021 | $ 16.74 | |
| Weighted Average Remaining Contractual Term, Outstanding (Years) | 8 years 11 months 23 days | 6 years 4 months 6 days |
| Weighted Average Remaining Contractual Term, Exercisable at end of year | 8 years 11 months 1 day | |
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- References No definition available.
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- Definition 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. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition 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. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition 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. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Gross number of share options (or share units) granted during the period. No definition available.
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- Definition Number of options outstanding, including both vested and non-vested options. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated. No definition available.
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. No definition available.
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- Definition 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. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition 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. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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