Share-based Compensation (Tables)

12 Months Ended

Dec. 31, 2019

Share-based Compensation

Schedule of share-based compensation expense

	Year Ended December 31,
	2019		2018		2017
	(in thousands)
Cost of goods sold	$	473	$	470	$	390
Research and development		340		344		394
Selling and marketing		293		731		913
General and administrative		1,811		1,776		2,354
	$	2,917	$	3,321	$	4,051

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

	Year Ended December 31,
	2019			2018			2017
Estimated dividend yield		0	%		0	%		0	%
Expected stock price volatility		60	%		60	%		60	%
Weighted-average risk-free interest rate		2.44	%		2.75	%		2.01	%
Expected life of option in years		6.08			6.13			6.06
Weighted-average option fair value at grant	$	1.24		$	3.93		$	4.09

Summary of outstanding and exercisable options

		Weighted-
	Number of	Average		Intrinsic
	Options	Exercise Price		Value
				(in thousands)
Outstanding at December 31, 2017	2,454,973	$	11.195	$	4,764
Exercisable at December 31, 2017	1,137,766	$	10.919	$	2,890
Granted	1,753,539	$	6.786
Exercised	(832)		0.320
Expired, forfeited or cancelled	(760,795)		11.281
Outstanding at December 31, 2018	3,446,885	$	8.935	$	70
Exercisable at December 31, 2018	1,643,011	$	10.627	$	70
Granted	2,119,708	$	2.163
Exercised	(36,040)		0.320
Expired, forfeited or cancelled	(1,099,587)		9.816
Outstanding at December 31, 2019	4,430,966	$	5.551	$	53
Exercisable at December 31, 2019	1,518,972	$	8.735	$	31

Summary of outstanding RSUs

		Weighted-
	Number of	Average
	RSUs	Fair Value
Outstanding at December 31, 2017	85,000	$	7.15
Granted	93,750		8.30
Vested	(33,748)		7.34
Expired, forfeited or cancelled	(69,688)		7.77
Outstanding at December 31, 2018	75,314	$	7.93
Granted	—		—
Vested	(21,251)		7.86
Expired, forfeited or cancelled	—		—
Outstanding at December 31, 2019	54,063	$	7.96