Stockholders' Equity (Tables) |
9 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Sep. 30, 2017 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Stockholders' equity (deficit): | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Schedule of equity compensation plans |
Stock option activity under all of the Company’s Plans during the nine months ended September 30, 2017 is summarized below:
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Schedule of assumptions used in calculating the fair value under the Black-Scholes option-pricing model |
The estimated grant date fair values of options granted during the three months ended September 30, 2017 were calculated using the Black-Scholes valuation model, based on the following assumptions:
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Schedule of share-based compensation expense |
The Company records share-based compensation expense on a straight-line basis over the related vesting period. For the three and nine months ended September 30, 2017 and 2016, share-based compensation expense related to options was:
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Schedule of common stock warrant activity |
Warrants have generally been issued for terms of up to five years. Common stock warrant activity for the nine months ended September 30, 2017 was as follows:
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