Share-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2019

Canceled/expired

Stock-based employee compensation expense

The following table summarizes the amount of share-based compensation expense by line item on the statements of operations:

Share-based compensation expense		Three Months Ended				Six Months Ended
		June 30,				June 30,
(in thousands)		2019		2018		2019		2018
Cost of product revenue	$	-	$	-	$	1	$	-
Research and development expense		76		88		199		267
Sales, marketing, general and administrative expense		192		131		419		272
	$	268	$	219	$	619	$	539

Options activity and positions

The following table summarizes shares, weighted-average exercise price, weighted-average remaining contractual term and aggregate intrinsic value of options outstanding and options exercisable as of June 30, 2019:

				Weighted-
			Weighted-	Average
			Average	Remaining		Aggregate
			Exercise	Contractual		Intrinsic
Options	Shares		Price	Term (years)		Value
Outstanding as of June 30, 2019	4,437,000	$	2.03	6.8	$	44,000
Exercisable as of June 30, 2019	2,348,000	$	2.72	5.0	$	6,000