Share-Based Compensation (Tables)

3 Months Ended

Mar. 31, 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:

		Three Months Ended
		March 31,
(in thousands)		2019		2018
Cost of product revenue	$	1	$	-
Research and development expense		123		179
Sales, marketing, general and administrative expense		227		141
	$	351	$	320

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 March 31, 2019:

				Weighted-
			Weighted-	Average
			Average	Remaining		Aggregate
			Exercise	Contractual		Intrinsic
Options	Shares		Price	Term (years)		Value
Outstanding as of March 31, 2019	4,494,000	$	2.26	6.9	$	20,000
Exercisable as of March 31, 2019	2,355,000	$	2.94	5.3	$	5,000