. Stock-Based Compensation

The Company recorded total stock-based compensation expense for stock options, stock awards and the

2011

Employee Stock Purchase Plan, or ESPP, as follows (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	201 9		201 8		201 9		201 8
Cost of goods sold	$	68	$	74	$	129	$	161
Research and development		233		377		457		809
Selling, general and administrative		1,045		597		1,867		1,158
Total	$	1,346	$	1,048	$	2,453	$	2,128

As of

June 30, 2019,

there were

1,895,351

shares available for grant,

12,773,640

options outstanding and

959,642

restricted stock units outstanding under the Company’s

2011

Equity Incentive Plan and

773,754

shares available for grant under the ESPP.