STOCK-BASED COMPENSATION (Tables)

3 Months Ended

Mar. 31, 2020

STOCK-BASED COMPENSATION

Summary of ESPP expense incurred under the 2016 Employee Stock Purchase Plan and stock-based compensation expense incurred

The following table summarizes ESPP expense incurred under the 2016 Employee Stock Purchase Plan and included in our accompanying unaudited interim condensed consolidated statements of operations:

(in thousands)	Three Months Ended March 31,
	2020		2019
Cost of sales	$	4	$	3
Research and development		7		5
Selling, general, and administrative		18		22
	$	29	$	30

The following table susmmarizes stock-based compensation expense incurred under the 2008 Plan and included in our accompanying unaudited interim condensed consolidated statements of operations: 

(in thousands)	Three Months Ended March 31,
	2020		2019
Cost of sales	$	26	$	21
Research and development		187		113
Selling, general, and administrative		2,182		1,546
	$	2,395	$	1,680

Summary of Stock option and restricted stock activity

A summary of stock option and restricted stock activity under the 2008 Plan during the three months ended March 31, 2020 and 2019 is presented below:

(in thousands)	Options	RSAs
Outstanding December 31, 2018	759	117
Granted	157	122
Options Exercised/RSAs Vested	(58)	(11)
Forfeited	(18)	(2)
Expired	(1)	—
Outstanding March 31, 2019	839	226
Outstanding December 31, 2019	757	192
Granted	8	—
Options Exercised/RSAs Vested	(7)	(49)	(1)
Forfeited	(3)	—
Expired	—	—
Outstanding March 31, 2020	755	143