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Additional Paid-In Capital | 6 Months Ended
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Jun. 30, 2013
Additional Paid-In Capital [Abstract] |
Additional Paid-In Capital | 10. Additional Paid-in Capital
|  | Warrants |  |  | Stock options and RSUs |  |  | Compensation options |  |  | Other paid-in capital |  |  | Total additional paid-in capital
As of December 31, 2012 | $ | 12,936 |  | $ | 7,655 |  | $ | 294 |  | $ | 11,270 |  | $ | 32,155
Stock options amortization |  | - |  |  | 218 |  |  | - |  |  | - |  |  | 218
Restricted stock units expensed |  | - |  |  | 526 |  |  | - |  |  | - |  |  | 526
Restricted stock units exercised |  | - |  |  | (410) |  |  | - |  |  | - |  |  | (410)
Compensation options expired |  | - |  |  | - |  |  | (294) |  |  | 294 |  |  | -
As of June 30, 2013 | $ | 12,936 |  | $ | 7,989 |  | $ | - |  | $ | 11,564 |  | $ | 32,489
Warrants Warrant activity is summarized in the following table:
|  | Warrants outstanding |  | Valuation |  | Weighted average exercise price per share |  | Weighted average remaining life (yrs.) |  | Intrinsic value
As of December 31, 2012 |  | 19,977,743 | $ | 12,936 | $ | 4.25 |  | 2.6 | $ | -
As of June 30, 2013 |  | 19,977,743 | $ | 12,936 | $ | 4.25 |  | 2.1 | $ | -
The 19,977,743 outstanding warrants expire in the following time frames: 2,666,666 expire in July 2014, 2,091,275 expire in December 2014, and 15,219,802 expire in October 2015. Compensation Options
|  | Compensation options outstanding |  |  | Valuation |  |  | Weighted average exercise price per share |  | Expiry date |  | Weighted average remaining life (yrs.)
As of December 31, 2012 |  | 225,000 |  | $ | 294 |  | $ | 3.30 |  | April 2013 |  | 0.3
Expired |  | (225,000) |  |  | (294) |  |  |  |  |  |  |
As of June 30, 2013 |  | - |  | $ | - |  |  |  |  |  |  |
Stock-Based Compensation Under our Stock Option Plan (the “Plan”) and our Long-Term Equity Incentive Plan (the “LTIP”), we may grant stock options and/or restricted stock units (defined above as “RSUs”) or restricted stock awards (“RSAs”) to our directors, officers, employees and consultants. The combined maximum number of our common shares that may be reserved for issuance under the Plan and the LTIP is a variable number equal to 10% of the issued and outstanding common shares on a non-diluted basis. Options under the Plan are granted from time to time at the discretion of the Board of Directors (“Board”), with vesting periods and other terms as determined by the Board. The LTIP is administered by the Board, which can delegate the administration to the Compensation Committee of the Board or to such other officers and employees of Vista as designated by the Board. Stock-based compensation expense for the three and six months ended June 30, 2013 and 2012 is as follows:
|  | Three months ended June 30, |  | Six months ended June 30, |
|  | 2013 |  |  | 2012 |  | 2013 |  |  | 2012 |
Stock options | $ | 110 |  | $ | 205 | $ | 218 |  | $ | 442 |
Restricted stock units |  | (242) |  |  | 775 |  | 526 |  |  | 1,550 |
| $ | (132) |  | $ | 980 | $ | 744 |  | $ | 1,992 |
As of June 30, 2013, stock options and RSUs had unrecognized compensation expense of $96 and $1,888, respectively, which is expected to be recognized over a weighted average period of 0.32 and 1.62 years, respectively. The negative RSU expense during the three months ended June 30, 2013 is due to cancelled or forfeited RSUs during the period. Stock Options A summary of stock option activity under the Plan as of June 30, 2013 and changes during the period then ended is set forth in the following table:
|  | Number of options |  | Weighted average exercise price per option |  | Weighted average remaining contractual term |  | Aggregate intrinsic value
Outstanding - December 31, 2012 |  | 3,102,500 | $ | 2.80 |  | 2.68 | $ | 637
Cancelled/Forfeited |  | (130,000) |  | 3.16 |  |  |  |
Expired |  | (120,000) |  | 3.5 7 |  |  |  |
Outstanding - June 30, 2013 |  | 2,852,500 | $ | 2.76 |  | 2.09 | $ | -
Exercisable - June 30, 2013 |  | 2,552,500 | $ | 2.73 |  | 1.88 | $ | -
A summary of the status of our unvested stock options as of June 30, 2013 and changes during the period then ended is set forth in the following table:
|  |  |  |  |  | Number of options |  | Weighted average grant-date fair value per option |  | Weighted average remaining amortization period (Years)
Unvested - December 31, 2012 |  |  |  |  |  | 300,000 | $ | 1.47 |  |
Unvested - June 30, 2013 |  |  |  |  |  | 300,000 | $ | 1.47 |  | 0.32
Restricted Stock Units A summary of RSU activity under the LTIP as of June 30, 2013 and changes during the period then ended is set forth in the following table:
|  | Number of units |  | Weighted average fair value
Unvested - December 31, 2012 |  | 1,994,507 | $ | 3.52
Cancelled/forfeited |  | (351,340) |  | 3.58
Vested |  | (116,875) |  | 3.51
Granted |  | 51,424 |  | 1.68
Unvested - June 30, 2013 |  | 1,577,716 | $ | 3.43
In general, a portion of the RSUs vest over a defined period of time, usually three years, and the remainder vest subject to certain Company and/or share price performance criteria, provided the recipient continues to be affiliated with Vista on the vesting date.

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