Stock-Based Compensation	9 Months Ended
Sep. 30, 2017
Stock-Based Compensation [Abstract]
Stock-Based Compensation	Note 5 — Stock-Based Compensation We have a stock incentive plan for employees and others called the VirnetX Holding Corporation 2013 Equity Incentive Plan (the “Plan”), which has been approved by our stockholders. In May 2017, the Board approved an amendment and restatement of the Plan to, among other things, increase the shares reserved under the Plan by 2,500,000 shares (the “Plan Amendment”). Our stockholders approved of the Plan Amendment at the 2017 Annual Meeting of Stockholders held on June 1, 2017. The Plan provides for grants of 16,624,469 shares of our common stock, including stock options and restricted stock units (“RSUs”), and will expire in 2023. As of September 30, 2017, 2,244,631 shares remained available for grant under the Plan. During the three months ended September 30, 2017, we granted options for a total of 1,377,500 shares with a weighted average grant date fair value of $3.01 During the three months ended September 30, 2016, no options were granted. During the nine months ended September 30, 2017, we granted options for a total of 1,733,500 shares. The weighted average fair values at the grant dates for options issued during the nine months ended September 30, 2017 was $2.93 per option. The fair values of options at the grant date were estimated utilizing the Black-Scholes valuation model with the following weighted average assumptions for the nine months ended September 30, 2017 (i) dividend yield on our common stock of 0 percent (ii) expected stock price volatility of 85 percent (iii) a risk-free interest rate of 1.93 percent and (iv) and expected option term of 6 years. During the nine months ended September 30, 2016, we granted options for a total of 429,000 shares with a weighted average grant date fair value of $3.25. The fair values of options at the grant date were estimated utilizing the Black-Scholes valuation model with the following weighted average assumptions for the nine months ended September 30, 2016 (i) dividend yield on our common stock of 0 percent (ii) expected stock price volatility of 80 percent (iii) a risk-free interest rate of 1.84 percent and (iv) an expected option term of 6 years. During the three months ended September 30, 2017 and 2016, we granted no RSUs. During the nine months ended September 30, 2017 and 2016, we granted 220,664 and 219,331 RSUs, respectively. The weighted average fair values of at the grant dates for RSUs issued during the nine months ended September 30, 2017 and 2016 were $3.83 and $4.75 per RSU, respectively. RSUs, which are subject to forfeiture if service terminates prior to the shares vesting, are expensed ratably over the vesting period. Stock-based compensation expense included in general and administrative expense was $1,064 and $2,780 for the three and nine months ended September 30, 2017, respectively, and $1,423 and $3,979 for the three and nine months ended September 30, 2016, respectively. As of September 30, 2017, the unrecognized stock-based compensation expense related to non-vested stock options and RSUs was $7,180 and $2,241, respectively, which will be amortized over an estimated weighted average period of approximately 3.34 and 2.68 years, respectively. During the nine-month period ended September 30, 2017 we issued 164,146 new shares of common stock as a result of vesting RSUs.

Note 5 — Stock-Based Compensation

We have a stock incentive plan for employees and others called the VirnetX Holding Corporation 2013 Equity Incentive Plan (the “Plan”), which has been approved by our stockholders. In May 2017, the Board approved an amendment and restatement of the Plan to, among other things, increase the shares reserved under the Plan by 2,500,000 shares (the “Plan Amendment”). Our stockholders approved of the Plan Amendment at the 2017 Annual Meeting of Stockholders held on June 1, 2017. The Plan provides for grants of 16,624,469 shares of our common stock, including stock options and restricted stock units (“RSUs”), and will expire in 2023. As of September 30, 2017, 2,244,631 shares remained available for grant under the Plan.

During the three months ended September 30, 2017, we granted options for a total of 1,377,500 shares with a weighted average grant date fair value of $3.01 During the three months ended September 30, 2016, no options were granted.

During the nine months ended September 30, 2017, we granted options for a total of 1,733,500 shares. The weighted average fair values at the grant dates for options issued during the nine months ended September 30, 2017 was $2.93 per option. The fair values of options at the grant date were estimated utilizing the Black-Scholes valuation model with the following weighted average assumptions for the nine months ended September 30, 2017 (i) dividend yield on our common stock of 0 percent (ii) expected stock price volatility of 85 percent (iii) a risk-free interest rate of 1.93 percent and (iv) and expected option term of 6 years.

During the nine months ended September 30, 2016, we granted options for a total of 429,000 shares with a weighted average grant date fair value of $3.25. The fair values of options at the grant date were estimated utilizing the Black-Scholes valuation model with the following weighted average assumptions for the nine months ended September 30, 2016 (i) dividend yield on our common stock of 0 percent (ii) expected stock price volatility of 80 percent (iii) a risk-free interest rate of 1.84 percent and (iv) an expected option term of 6 years.

During the three months ended September 30, 2017 and 2016, we granted no RSUs.

During the nine months ended September 30, 2017 and 2016, we granted 220,664 and 219,331 RSUs, respectively. The weighted average fair values of at the grant dates for RSUs issued during the nine months ended September 30, 2017 and 2016 were $3.83 and $4.75 per RSU, respectively. RSUs, which are subject to forfeiture if service terminates prior to the shares vesting, are expensed ratably over the vesting period.

Stock-based compensation expense included in general and administrative expense was $1,064 and $2,780 for the three and nine months ended September 30, 2017, respectively, and $1,423 and $3,979 for the three and nine months ended September 30, 2016, respectively.

As of September 30, 2017, the unrecognized stock-based compensation expense related to non-vested stock options and RSUs was $7,180 and $2,241, respectively, which will be amortized over an estimated weighted average period of approximately 3.34 and 2.68 years, respectively.

During the nine-month period ended September 30, 2017 we issued 164,146 new shares of common stock as a result of vesting RSUs.