Share-based Compensation (Tables)

9 Months Ended

Sep. 30, 2019

Share-based Compensation

Schedule of share-based compensation expense

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2019		2018		2019		2018
	(in thousands)
Cost of goods sold	$	139	$	138	$	426	$	380
Research and development		94		129		299		328
Selling and marketing		61		273		272		836
General and administrative		342		309		1,535		1,358
	$	636	$	849	$	2,532	$	2,902

Schedule of weighted-average key assumptions used in determining fair value of options granted

	Nine Months Ended
	September 30, 2019
Estimated dividend yield		0.00	%
Expected stock price volatility		60.00	%
Weighted-average risk-free interest rate		2.50	%
Expected life of option in years		6.07
Weighted-average option fair value at grant	$	1.25

Summary of outstanding and exercisable options

		Weighted-
	Number of	Average		Intrinsic
	Options	Exercise Price		Value
				(in thousands)
Outstanding at December 31, 2018	3,446,885	$	8.94	$	70
Exercisable at December 31, 2018	1,643,011	$	10.63	$	70
Granted	2,082,958		2.18
Exercised	(36,040)		0.32
Expired, forfeited or cancelled	(946,006)		10.34
Outstanding at September 30, 2019	4,547,797	$	5.62	$	39
Exercisable at September 30, 2019	1,436,254	$	9.18	$	23

Summary of outstanding RSUs

		Weighted-
	Number of	Average
	RSUs	Fair Value
Outstanding at December 31, 2018	75,314	$	7.93
Granted	—		—
Vested	(19,688)		7.76
Expired, forfeited or cancelled	—		—
Outstanding at September 30, 2019	55,626	$	7.99