NOTE 8. STOCK PLANS

Stock-Based Compensation

The Company’s stock-based compensation expense recognized for the periods presented was as follows:

Restricted Stock

The Company’s restricted stock activity for the three months ended March 31, 2018 was as follows:

At March 31, 2018, total unrecognized compensation cost related to restricted stock was $742, which is expected to be recognized over a period of 2.1 years.

Restricted Stock Units

The Company’s restricted stock units activity for the three months ended March 31, 2018 was as follows:

As of March 31, 2018, total unrecognized compensation cost related to restricted stock units was $143, which is expected to be recognized over a period of 0.4 year.

Stock Options

The Company’s stock option activity for the three months ended March 31, 2018 was as follows:

The aggregate intrinsic values in the table above represents the difference between the fair market value of the Company’s common stock and the average option exercise price of in-the-money options multiplied by the number of such options. The weighted average grant date fair value of stock options granted during the three months ended March 31, 2018 was $7.91 per share. The aggregate intrinsic value of the options exercised during the three months ended March 31, 2018 was $692. The total grant date fair value of stock options vested during the three months ended March 31, 2018 was $1,761. At March 31, 2018, total unrecognized compensation expense related to stock options was $23,339 and is expected to be recognized over a weighted average period of 2.7 years.

Employee Stock Purchase Plan

On January 31, 2018, a total of 35,812 shares of common stock were purchased under the Company’s Employee Stock Purchase Plan. As of March 31, 2018, accrued employee contributions for future purchases under the Employee Stock Purchase Plan totaled $213.