Quarterly report pursuant to Section 13 or 15(d)

Stock Plans (Tables)

Stock Plans (Tables)

9 Months Ended

Sep. 30, 2020

Schedule of the stock-based compensation expense

The following table summarizes the stock-based compensation expense recorded for awards under our stock option plans: (in thousands)


	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2020		2019		2020		2019
Research and development	$	—	$	—	$	—	$	91
Selling, general and administrative		9		128		4		523
Total stock-based compensation	$	9	$	128	$	4	$	614

Schedule of assumptions to estimate the fair value of options


	Three Months Ended			Nine Months Ended
	September 30,			September 30,
	2020		2019	2020		2019
Weighted-average risk-free interest rate	0.3	%	—	0.4	%	2.2	%
Expected dividend payments	—		—	—		—
Expected holding period (years) 1	5.7		—	5.8		5.4
Weighted-average volatility factor 2	1.07		—	1.04		0.94
Estimated forfeiture rates for options granted 3	24	%	—	27	%	21	%

(1)

Expected holding period is based on historical experience of similar awards, giving consideration to the contractual terms of the stock-based awards, vesting schedules and the expectations of future employee behavior.

(2)

Weighted average volatility is based on the historical volatility of our common stock.

(3)

Estimated forfeiture rates are based on historical data.

Schedule of option activity

The following table summarizes option activity:


				Weighted
		Weighted		Average
		Average		Remaining	Aggregate
		Exercise		Option	Intrinsic
	Options (in	Price per		Term (in	Value (in
(in thousands)	thousands)	share		years)	thousands)
Outstanding December 31, 2019	1,192	$	6.23	7.9	$	—
Granted	60		0.27
Forfeited or expired	(334)		1.88
Outstanding at September 30, 2020	918		7.42	6.8		—
Exercisable at September 30, 2020	827		8.16	6.6		—