XOMA Corporation Quarterly report pursuant to Section 13 or 15(d)

Quarterly report pursuant to Section 13 or 15(d)

Stock-based Compensation (Tables)

Stock-based Compensation (Tables)

6 Months Ended

Jun. 30, 2019

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

The fair value of the stock options granted during the three and six months ended June 30, 2019 and 2018, was estimated based on the following weighted average assumptions:

	Three Months Ended June 30,						Six Months Ended June 30,
	2019			2018			2019			2018
Dividend yield		0	%		0	%		0	%		0	%
Expected volatility		102	%		102	%		103	%		101	%
Risk-free interest rate		2.21	%		2.98	%		2.51	%		2.71	%
Expected term	5.60 years			5.55 years			5.60 years			5.60 years

Stock Option Activity

Stock option activity for the six months ended June 30, 2019, was as follows:

	Number of shares			Weighted Average Exercise Price Per Share		Weighted Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value (in thousands)
Outstanding at beginning of year		1,624,746		$	23.09
Granted		390,814			14.38
Exercised		(25,861	)		4.77
Forfeited, expired or cancelled		(37,317	)		60.01
Outstanding at end of period		1,952,382		$	20.88		7.7	$	7,856
Exercisable at end of period		1,246,774		$	23.62		7.1	$	6,574

Stock-based Compensation Expense

The following table shows total stock-based compensation expense for stock options, RSUs and ESPP in the condensed consolidated statements of operations and comprehensive loss (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
Research and development	$	59	$	95	$	108	$	199
General and administrative		952		675		2,631		1,987
Total stock-based compensation expense	$	1,011	$	770	$	2,739	$	2,186