Share-based Compensation (Tables)

3 Months Ended

Mar. 31, 2020

Share-based Compensation

Schedule of share-based compensation expense

	Three Months Ended
	March 31,
	2020		2019
	(in thousands)
Cost of goods sold	$	86	$	144
Research and development		85		90
Selling and marketing		93		120
General and administrative		638		520
	$	902	$	874

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

	Three Months Ended
	March 31, 2020
Estimated dividend yield		0	%
Expected stock price volatility		73.65	%
Weighted-average risk-free interest rate		1.00	%
Expected life of option in years		6.25
Weighted-average option fair value at grant	$	0.74

Summary of outstanding and exercisable options

		Weighted-
	Number of	Average		Intrinsic
	Options	Exercise Price		Value
				(in thousands)
Outstanding at December 31, 2019	4,430,966	$	5.551	$	53
Exercisable at December 31, 2019	1,518,972	$	8.735	$	31
Granted	1,897,250		1.141
Exercised	(833)		0.320
Expired, forfeited or cancelled	(221,513)		4.730
Outstanding at March 31, 2020	6,105,870	$	4.211	$	54
Exercisable at March 31, 2020	2,131,328	$	7.118	$	4

Summary of outstanding RSUs

		Weighted-
	Number of	Average
	RSUs	Fair Value
Outstanding at December 31, 2019	54,063	$	7.96
Granted	741,750		1.49
Vested	(11,563)		8.30
Expired, forfeited or cancelled	—		—
Outstanding at March 31, 2020	784,250	$	1.84