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Additional Paid-In Capital | 6 Months Ended
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Jun. 30, 2014
Additional Paid-In Capital [Abstract] |
Additional Paid-In Capital | 8. Additional Paid-in Capital
|  | Warrants |  |  | Stock options and RSUs |  |  | Other paid-in capital |  |  | Total additional paid-in capital
As of December 31, 2013 | $ | 12,936 |  | $ | 7,987 |  | $ | 11,564 |  | $ | 32,487
Stock options amortization |  | - |  |  | 123 |  |  | - |  |  | 123
Restricted stock units expensed |  | - |  |  | 625 |  |  | - |  |  | 625
As of June 30, 2014 | $ | 12,936 |  | $ | 8,735 |  | $ | 11,564 |  | $ | 33,235
Warrants Warrant activity is summarized in the following table:
|  | Warrants outstanding |  | Fair value at issuance date |  | Weighted average exercise price per share |  | Weighted average remaining life (yrs.) |  | Intrinsic value
As of December 31, 2013 |  | 19,977,743 | $ | 12,936 | $ | 4.63 |  | 1.6 | $ | -
As of June 30, 2014 |  | 19,977,743 | $ | 12,936 | $ | 4.63 |  | 1.1 | $ | -
The 19,977,743 outstanding warrants expire in the following time frames: 2,666,666 expire July 2014 (see Note 13 for subsequent event discussion), 2,091,275 expire December 2014, and 15,219,802 expire in October 2015. Stock-Based Compensation Under our Stock Option Plan (the “Plan”) and our Long-Term Equity Incentive Plan (the “LTIP”), we may grant options and/or restricted stock units (“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 of the Company (“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, 2014 and 2013 is as follows:
|  | Three months ended June 30, |  |  | Six months ended June 30,
|  | 2014 |  |  | 2013 |  |  | 2014 |  |  | 2013
Stock options | $ | 19 |  | $ | 110 |  | $ | 123 |  | $ | 218
Restricted stock units |  | 315 |  |  | (242) |  |  | 625 |  |  | 526
| $ | 334 |  | $ | (132) |  | $ | 748 |  | $ | 744
As of June 30, 2014, stock options and RSUs had unrecognized compensation expense of $57 and $1,187, respectively, which is expected to be recognized over a weighted average period of 2.20 and 1.52 years, respectively. Stock Options A summary of option activity under the Plan as of June 30, 2014 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, 2013 |  | 2,882,500 | $ | 1.79 |  | 3.07 | $ | 54
Granted |  | 175,000 |  | 0.52 |  |  |  |
Expired |  | (140,000) |  | 2.15 |  |  |  |
Outstanding - June 30, 2014 |  | 2,917,500 | $ | 1.70 |  | 2.80 | $ | 135
Exercisable - June 30, 2014 |  | 2,196,250 | $ | 2.13 |  | 2.22 | $ | 60
A summary of our unvested stock options as of June 30, 2014 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, 2013 |  |  |  |  |  | 738,750 | $ | 0.22 |  |
Granted |  |  |  |  |  | 175,000 |  |  |  |
Vested |  |  |  |  |  | (192,500) |  |  |  |
Unvested - June 30, 2014 |  |  |  |  |  | 721,250 | $ | 0.24 |  | 2.20
The fair value of stock options granted to employees, directors and consultants was estimated at the grant date using the Black-Scholes option pricing model using the following assumptions:
|  | June 30, 2014
Expected volatility |  | 69.17%
Risk-free interest rate |  | 1.75%
Expected life (years) |  | 5
Dividend yield |  | N/A
Forfeiture assumption |  | 10%
Option pricing models require the input of highly subjective assumptions, including the expected price volatility. Expected price volatility is based on the historical volatility of our common shares. Changes in the subjective input assumptions can materially affect the fair value estimate. The expected term of the options granted represents the period of time that the options granted are expected to be outstanding. The risk-free rate for the periods within the contractual term of the option is based on the U.S. Treasury yield curve in effect at the date of grant. Restricted Stock Units The following table summarizes the RSU activity under the LTIP as of June 30, 2014 and changes during the years then ended:
|  | Number of units |  | Weighted average grant-date fair value per unit
Unvested - December 31, 2013 |  | 2,594,464 | $ | 2.00
Unvested - June 30, 2014 |  | 2,594,464 | $ | 2.00
A portion of the RSU awards vest on a fixed future date provided the recipient continues to be affiliated with Vista on that date. Other RSU awards vest subject to certain performance criteria, including the accomplishment of certain corporate objectives and the Company’s share price performance. The vesting period for time based RSUs is at least one year.

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