In October 2005, our shareholders approved a stock option and incentive plan (the “2005 Plan”) under which 4,800,000 shares of common stock were reserved for the issuance of awards, including incentive stock options and non-qualified stock options, stock appreciation rights, restricted stock, unrestricted stock, restricted stock units, performance shares, performance units (including performance options) and other share-based awards. The 2005 Plan provides that our employees and directors may, at the discretion of the Board of Directors ("Board") or a duly designated compensation committee, be granted certain share-based awards. In the case of option awards granted under the 2005 Plan, the exercise price of each option is determined based on the date of grant and expire no later than 10 years from the date of grant. Awards granted pursuant to the 2005 Plan are subject to the vesting schedule or performance metrics set forth in the agreements pursuant to which they are granted. Upon a change of control of our Company, as such term is defined in the 2005 Plan, awards under the 2005 Plan will fully vest under certain circumstances. The 2005 Plan expired on May 25, 2015. As of June 30, 2019, there were 264,420 outstanding options under the 2005 Plan.

In August 2015, our shareholders approved a stock option and incentive plan (the “2015 Plan”) under which 11,500,000 shares of common stock were reserved for the issuance of awards, including incentive stock options and non-qualified stock options, stock appreciation rights, restricted stock awards and restricted stock unit awards, performance stock awards and other share-based awards. In August 2017, our shareholders approved an amendment to our 2015 Equity Incentive Plan, (the “Amended 2015 Plan”), to, among other items, increase the number of shares of common stock reserved for issuance thereunder by 6,000,000. The Amended 2015 Plan provides that our employees and directors may, at the discretion of the Board of Directors or a duly designated compensation committee, be granted certain share-based awards. In the case of option awards granted under the Amended 2015 Plan, the exercise price of each option is determined based on the date of grant and expire no later than 10 years from the date of grant. Awards granted pursuant to the Amended 2015 Plan are subject to the vesting schedule or performance metrics set forth in the agreements pursuant to which they are granted. Upon a change of control of our Company, as such term is defined in the Amended 2015 Plan, awards under the Amended 2015 Plan will fully vest under certain circumstances. As of June 30, 2019, there were 2,792,705 outstanding options, 1,946,725 outstanding shares of restricted stock awards, 46,375 outstanding shares of performance stock awards, and 5,020,749 shares available for future grant under the Amended 2015 Plan.

The following table summarizes the stock option transactions during the three months ended June 30, 2019:

				Weighted-		Weighted-
				Average		Average		Aggregate
				Exercise		Remaining		Intrinsic
Employee Stock Options Summary	Number of			Price		Contractual		Value
	Shares			per Share		Life (years)		(in thousands)
Outstanding, March 31, 2019		3,166,525		$	15.36		5.5	$	7,040
Exercised		(36,300	)		12.52		3.7	$	85
Forfeited/Canceled		(38,700	)		27.67		1.6
Expired		(34,400	)		43.04
Outstanding, June 30, 2019		3,057,125		$	14.88		5.4	$	15,915
Vested and expected to vest, June 30, 2019		2,801,387		$	14.90		5.3	$	14,575
Exercisable, June 30, 2019		1,491,953		$	15.06		4.8	$	7,718

Non-vested stock option award activity during the three months ended June 30, 2019 is summarized as follows:

				Weighted-
				Average
				Grant-Date
Non-Vested Stock Option Award Summary	Number of			Fair Value
	Shares			per Share
Outstanding, March 31, 2019		1,845,855		$	5.52
Vested		(276,283	)		5.41
Forfeited/Canceled		(4,400	)		6.62
Outstanding, June 30, 2019		1,565,172		$	5.54

As of June 30, 2019, $7,072 of total unrecognized compensation costs related to stock options is expected to be recognized over a weighted-average period of 2.1 years. This amount does not include the cost of new options that may be granted in future periods or any changes in our forfeiture percentage. The total fair value of options vested during the three months ended June 30, 2019 was $1,494.

Restricted stock awards activity during the three months ended June 30, 2019 is summarized as follows:

				Weighted-
				Average
				Grant-Date
Restricted Stock	Number of			Fair Value
	Shares			per Share
Outstanding, March 31, 2019		1,715,958		$	16.29
Granted		623,705			19.25
Vested		(373,038	)		15.75
Canceled		(19,900	)		16.21
Outstanding, June 30, 2019		1,946,725		$	17.35

Share-based compensation expense related to restricted stock awards was $3,296 and $1,920 for the three months ended June 30, 2019 and 2018, respectively.

The weighted-average grant date fair value for the restricted stock awards was estimated using the market price of the common stock on the date of grant. The fair value of the restricted stock awards is amortized on a straight-line basis over the vesting period, which is generally between one to four years.

As of June 30, 2019, $28,350 of total unrecognized compensation costs related to restricted stock awards is expected to be recognized over a weighted-average period of 2.1 years. This amount does not include the cost of new restricted stock awards that may be granted in future periods.

On December 29, 2016, the Compensation Committee of the Board approved 123,082 performance stock awards to be granted to certain executive officers, of which 46,375 shares are currently outstanding. The performance stock awards vest in four equal increments on each of the first four anniversaries of the grant date, subject in each case to the executive officer’s continued service and achievement of certain Company performance goals, including strong stock price performance. The weighted-average grant date fair value of the awards was $10.63 per share, which was estimated using a Monte Carlo-based valuation model. Share-based compensation expense related to the performance stock awards was $61 for the three months ended June 30, 2019.

On October 23, 2018, the Compensation Committee of the Board approved 248,140 performance stock unit awards to be granted to certain executives and non-executive members of the executive leadership team, which vest only in the event certain performance goals are achieved and with continuous service through the date the goals are certified. Approximately 34% of the performance stock units are tied to our cumulative 3-year total shareholder return, 33% are tied to our fiscal year 2021 revenue, and 33% are tied to our fiscal year 2021 adjusted earnings per share goals, each as specifically defined in the equity award agreements. The number of shares to be issued may vary between 50% and 200% of the number of performance stock units depending on performance, and no such shares will be issued if threshold performance is not achieved. The weighted-average grant date fair value of the awards was $17.84 per share, which was estimated using a Monte Carlo-based valuation model for the awards based on total shareholder return and using a probability-adjusted achievement rate combined with the market price of the common stock on the date of grant for the awards based on revenue and earnings per share targets. Share-based compensation expense related to the performance stock unit awards was $438 for the three months ended June 30, 2019.

On August 11, 2014, our shareholders approved an Employee Share Purchase Plan (the “Purchase Plan”) under which 4,000,000 shares of common stock were reserved for future grant. The Purchase Plan allows eligible employees to purchase shares through payroll deductions of up to 15% of total base salary at a price equal to 90% of the lower of the fair market values of the shares as of the beginning or the end of the corresponding offering period. Any shares purchased under the Purchase Plan are subject to a six-month holding period. Employees are limited to purchasing no more than 1,500 shares on any single purchase date and no more than $25 in total fair market value of shares during any one calendar year. As of June 30, 2019, we have issued 497,487 shares under the Purchase Plan and 3,502,513 shares are available for future issuance.

Share-based compensation expense recorded for the employee share purchase plan was $122 and $132 for the three months ended June 30, 2019 and 2018, respectively.