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Stock Based Compensation - Schedule of activity with respect to non-vested stock options (Details) - Non vested equity awards shares in Thousands | 12 Months Ended
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Dec. 31, 2018 $ / shares shares
Shares |
Balance at January 1, 2018 (in shares) | shares | 158
Granted (in shares) | shares | 79
Vested (in shares) | shares | (31)
Forfeited and cancelled (in shares) | shares | (13)
Balance at December 31, 2018 (in shares) | shares | 193
Weighted Average grant- date fair value |
Balance at January 1, 2018 (in dollars per share) | $ / shares | $ 6.49
Granted (in dollars per share) | $ / shares | 17.08
Vested (in dollars per share) | $ / shares | 10.81
Forfeited and cancelled (in dollars per share) | $ / shares | 10.21
Balance at 2018 (in dollars per share) | $ / shares | $ 9.88

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- Definition Weighted average fair value as of the grant date of nonvested stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + References No definition available. + Details
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- Definition The number of shares under nonvested 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 Gross number of nonvested share options (or share units) granted during the period. + References No definition available. + Details
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- Definition The weighted average grant-date fair value of non vested options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References No definition available. + Details
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- Definition The number of shares reserved for issuance under nonvested option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date. + References No definition available. + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition The number of shares under nonvested options that were vested during the reporting period. + References No definition available. + Details
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- Definition The weighted average fair value as of grant date pertaining to nonvested stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + References No definition available. + Details
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- Definition The weighted average fair value of nonvested awards on option plans for which the employer is contingently obligated to transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + References No definition available. + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Details
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