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Stock-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2013
Stock-Based Compensation [Abstract] |
Stock-based compensation expense | Our stock-based compensation expense for the first quarter ended March 31 was as follows:
|  | Three months ended March 31, |
|  | 2013 |  |  | 2012 |
Research and development expense |  | $ | 343,711 |  |  | $ | 331,874 |
Selling, general and administrative expense |  |  | 342,871 |  |  |  | 404,671 |
Total employee stock-based compensation |  | $ | 686,582 |  |  | $ | 736,545 |
Effect on basic and diluted net loss per share |  | $ | (0.02 | ) |  | $ | (0.03 | )
Stock option activity | A summary of our stock option activity for the three months ended March 31, 2013 is as follows:
|  | Number of options |  |  | Weighted-average exercise price ($) per share |
Balance at December 31, 2012 |  |  | 447,359 |  |  |  | 19.59 |
Granted |  |  | — |  |  |  | — |
Exercised |  |  | — |  |  |  | — |
Cancelled |  |  | (3,433 | ) |  |  | 4.40 |
Outstanding options at March 31, 2013 |  |  | 443,926 |  |  |  | 19.70 |
Summary of changes in unvested options | A summary of changes in unvested options for the three months ended March 31, 2013 is as follows:
|  | Number of options |  |  | Weighted-average exercise price ($) per share |  |  | Weighted-average grant date fair value ($) per option |
Unvested options at December 31, 2012 |  |  | 64,503 |  |  |  | 10.86 |  |  |  | 8.67 |
Granted |  |  | — |  |  |  | — |  |  |  | — |
Vested |  |  | (13,037 | ) |  |  | 11.86 |  |  |  | 9.54 |
Cancelled |  |  | — |  |  |  | — |  |  |  | — |
Unvested options at March 31, 2013 |  |  | 51,466 |  |  |  | 10.61 |  |  |  | 8.45 |
Summary of restricted stock unit activity | A summary of our restricted stock units activity for the three months ended March 31, 2013 is as follows:
|  | Number of RSUs |  |  | Weighted-average grant date fair value ($) per RSU |
Outstanding at December 31, 2012 |  |  | 1,534,200 |  |  |  | 2.10 |
Granted(1) |  |  | 65,200 |  |  |  | 1.64 |
Vested and exercised |  |  | (362,418 | ) |  |  | 1.06 |
Cancelled |  |  | — |  |  |  | — |
Outstanding RSUs at March 31, 2013 |  |  | 1,236,982 |  |  |  | 2.38 |
(1) | 10,000 of these restricted stock units vest and convert into shares of our common stock after one year from the date of grant. 55,200 of these restricted stock units will vest and convert into shares of our common stock over a four year period from the date of grant; one-fourth of the award will vest on each grant date anniversary following the grant.
Summary of changes in SARs | A summary of the changes in SARs for the three months ended March 31, 2013 is as follows:
|  | Number of SARs |
Outstanding at December 31, 2012 |  |  | 110,593 |
Granted |  |  | — |
Exercised |  |  | — |
Forfeited and expired |  |  | — |
Outstanding SARs at March 31, 2013 |  |  | 110,593 |
SARs exercisable at March 31, 2013 |  |  | 110,593 |

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