Stock-based Compensation (Tables) |
9 Months Ended | 12 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Sep. 30, 2019 |
Dec. 31, 2018 |
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Share-based Payment Arrangement [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Schedule of Stock Option Valuation Assumption |
The fair value of our option awards granted during the year ended December 31, 2018 was estimated using the following assumptions:
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Schedule of Stock Option |
The following table summarizes our stock option activity for the year ended December 31, 2018:
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Schedule of Allocation of Stock-based Compensation Expense |
The allocation of stock-based compensation expense between research and development and general and administrative expense was as follows:
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