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StockBased Compensation (Details) - Employee Stock Option - $ / shares | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020
Shares options outstanding, beginning | 849,949 | 585,215
Shares, granted | 218,050 | 151,231
Shares, exercised | (39,620) |
shares, forfeited | (4,866) | (13,252)
Shares options outstanding, ending | 1,023,513 | 723,194
Shares, options exercisable | 504,189 | 305,778
Weighted average exercise price, beginning | $ 9.33 | $ 14.37
Weighted average exercise price, granted | 24.70 | 7.14
Weighted average exercise price, exercised | 7.32 |
Weighted average exercise price, forfeited | 7.67 | 11.54
Weighted average exercise price, ending | 12.69 | 9.71
Weighted average exercise price, options exercisable | 9.64 | 9.68
Weighted average grant date fair value for options granted during the period: | $ 16.39 | $ 4.55

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- References No definition available. + Details
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Balance Type: | na
Period Type: | duration

X
- 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. + References No definition available. + Details
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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. + References No definition available. + Details
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Namespace Prefix: | celc_
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- References No definition available. + Details
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- References No definition available. + Details
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- References No definition available. + Details
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Period Type: | duration

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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. + References No definition available. + Details
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Namespace Prefix: | celc_
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Balance Type: | na
Period Type: | duration

X
- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. + References No definition available. + Details
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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. + References No definition available. + Details
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. + References No definition available. + Details
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- Details
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