Common Stock (Tables) |
6 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Jun. 30, 2017 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Equity [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Summary of Stock Options Activity |
Stock option transactions and the number of stock options outstanding are summarized below:
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Summary of Fair Value of Option Awards |
The fair value of each stock award for employees and directors is estimated on the grant date and for consultants at each reporting period, using the Black-Scholes option-pricing model based on the weighted-average assumptions. No stock options were granted during the six months ended June 30, 2017. For the six months ended June 30, 2016, the weighted-average assumptions used in the Black-Scholes option-pricing model are noted in the following table:
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Summary of Share-Based Compensation Expense |
The results for the periods set forth below included share-based compensation expense for stock options and restricted stock units in the following expense categories of the consolidated statements of loss (in thousands):
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Summary of Restricted Stock Unit Award Activity |
The following table summarizes our restricted stock unit award activity during the six months ended June 30, 2017:
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Summary of Outstanding Warrants |
The following is a summary of outstanding warrants to purchase common stock at June 30, 2017:
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Summary of Fair Value of Warrants Issued |
The estimated fair value of warrants issued and classified as liabilities is reassessed at each reporting date using the Black-Scholes option pricing model.
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