Stock-based compensation (Tables) |
3 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Mar. 31, 2017 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Disclosure of Compensation Related Costs, Share-based Payments [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Stock-Based Compensation Expense |
Total stock-based compensation expense was recorded to operating expenses based upon the functional responsibilities of the individuals holding the respective options as follows:
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| Schedule of Fair Value Assumptions |
The weighted-average fair value of the options granted was $1.31 and $1.00 for the three months ended March 31, 2017 and 2016, respectively. The calculation was based on the following assumptions:
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