In March 2018, the Company adopted the 2018 Equity Incentive Plan (2018 Plan). The 2018 Plan replaced the Company’s 2015 Stock Plan (2015 Plan) and 3,570,000 shares were reserved under the 2018 Plan, along with any shares remaining available for issuance under the Company’s 2015 Plan or outstanding awards under its 2015 Plan that subsequently expire, lapse unexercised or are forfeited to or repurchased by the Company.

In January 2020, the Company adopted the 2020 Inducement Plan (2020 Plan). Under the 2020 Plan, 3,000,000 shares were reserved for issuance.

In June 2020, the Company issued a total of 658,950 shares of common stock under restricted stock agreements to its employees and directors under the 2018 Plan. At the date of grant, the shares had an estimated weighted average fair value of $29.41 per share. Under the terms of the restricted stock agreements, shares vest annually over four years for employees and over 12 months for directors. During the three and nine months ended September 30, 2020, 5,000 shares were forfeited. There were 653,950 shares of restricted stock outstanding at September 30, 2020.

Total stock-based compensation expense was recognized in the condensed consolidated statements of operations and comprehensive income (loss) as follows (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2020		2019		2020		2019
Research and development	$	3,075	$	978	$	7,179	$	2,693
General and administrative		2,927		1,762		6,755		3,851
Total stock-based compensation	$	6,002	$	2,740	$	13,934	$	6,544