Stock-Based Compensation (Tables)
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Mar. 31, 2013
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Stock-Based Compensation Expense Related to Common Stock Options, Common Stock, Restricted Common Stock and Common Stock Warrants | Following is the stock-based compensation expense related to common stock options, common stock, restricted common stock and common stock warrants:
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Summary of Stock Option Activity | The following table summarizes the stock option activity in the Company’s equity incentive plans, including non-plan grants to Company executives, from December 31, 2012 through March 31, 2013:
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Weighted Average Assumptions Used to Determine Fair Value of Options Granted | The fair value of all other options granted is determined using the Black-Scholes option-pricing model. The following weighted average assumptions were used (there were no option grants to employees or consultants during the three months ended March 31, 2013):
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