Stock-Based Compensation Plans

3 Months Ended

Mar. 31, 2020

Share-based Payment Arrangement, Noncash Expense [Abstract]

The components of stock-based compensation expense were as follows:



	Three months ended March 31,
	2020		2019
	(in thousands)
2007 Stock Incentive Plan	$	1,025	$	1,259
2018 Stock Incentive Plan	1,060		—
Employee Stock Purchase Plan	32		6
Total Stock Compensation Expense	$	2,117	$	1,265

The significant stock compensation plans are described below.

The 2007 Stock Incentive Plan (the “2007 Plan”) was adopted in May 2007. Under the 2007 Plan, a total of 2,800,000 shares were authorized for stock-based compensation available in the form of either restricted stock awards (“RSAs”) or stock options. The RSAs are subject to service-based vesting, typically between one and three years, where a specific period of continued employment must pass before an award vests. The expense associated with these awards is recognized on a straight-line basis over the respective vesting period, with forfeitures accounted for as they occur. For any vesting tranche of an award, the cumulative amount of compensation cost recognized is equal to the portion of the grant‑date fair value of the award tranche that is actually vested at that date. As of March 31, 2020, there were no stock options outstanding under the 2007 Plan.

The 2018 Stock Incentive Plan (the “2018 Plan”) was adopted in May 2018. Under the 2018 Plan, a total of 800,000 shares are authorized for stock-based compensation, plus the number of shares remaining under the 2007 Plan and any future forfeited awards under the 2007 Plan, in the form of RSAs. The RSAs are subject to service-based vesting, typically between one and three years, where a specific period of continued employment or service must pass before an award vests. The expense associated with these awards is recognized on a straight-line basis over the respective vesting period, with forfeitures accounted for as they occur. For any vesting tranche of an award, the cumulative amount of compensation cost recognized is equal to the portion of the grant‑date fair value of the award tranche that is actually vested at that date.

As of March 31, 2020, the Company had granted 279,400 RSAs under the 2018 Plan and had 615,196 shares available for future issuance. The fair value of the restricted stock awards equaled the stock price at the grant date.

The following table summarizes restricted stock activity under the 2007 and 2018 Plans during the three months ended March 31, 2020:



	Shares
Balance as of December 31, 2019	505,467
Shares granted	—
Shares forfeited	—
Shares vested	(60,811	)
Balance as of March 31, 2020	444,656

Under the Employee Stock Purchase Plan (“ESPP”), as amended and restated effective April 1, 2018, 325,000 shares of common stock have been reserved for issuance. Eligible employees may designate not more than 10% of their cash compensation to be deducted each pay period for the purchase of common stock under the ESPP. Participants may purchase not more than 1,000 shares or $25,000 of common stock in any one calendar year. Each January 31 and July 31 shares of common stock are purchased with the employees’ payroll deductions from the immediately preceding six months at a price per share of 85% of the lesser of the market price of the common stock on the purchase date or the market price of the common stock on the date of entry into an offering period. In the three months ended March 31, 2020 and 2019, 3,892 and 6,732 shares of common stock, respectively, were issued under the ESPP. The Company issues new shares through its transfer agent upon employee stock purchase.