Share-based Compensation (Tables)

9 Months Ended

Sep. 30, 2020

Share-based Payment Arrangement [Abstract]

Schedule of Share-based Compensation Expense

During the periods presented, the Company recorded the following share-based compensation expense for stock options and restricted stock awards:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2020		2019		2020		2019
	(in thousands)
Sales, general and administrative	$	945	$	1,337	$	3,392	$	4,018
Research and development	402		107		1,142		1,156
Total	$	1,347	$	1,444	$	4,534	$	5,174

Schedule of Stock Options

Stock Options

	Number of Options Outstanding	Weighted-Average Exercise Price		Weighted-Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value (in thousands)
Balances at December 31, 2019	1,837,576	$	14.54	8.06	$	24,122
Granted (weighted-average fair value of $10.64 per share)	367,265	19.11
Exercised	(83,652)	6.77
Forfeited/canceled	(114,000)	16.73
Balances at September 30, 2020	2,007,189	$	15.58	7.41	$	9,633

Schedule of Employee Stock Options Valuation Assumptions

The fair value of stock options granted to employees was estimated using the following assumptions:

	Nine Months Ended September 30,
	2020	2019
Volatility	55% - 60%	56%
Risk-free interest rate	0.4% - 1.5%	1.9% - 2.6%
Term (in years)	6.25	6.25
Dividend yield	—	—

The fair value of stock options granted to consultants was estimated using the following assumptions during the following periods presented:

	Nine Months Ended September 30,
	2020	2019
Volatility	56% - 60%	57%
Risk-free interest rate	0.6% - 1.6%	2.1%
Term (in years)	10	10
Dividend yield	—	—

Schedule of Restricted Stock

The following table represents RSA activity for fiscal 2020:

	Restricted Stock Awards	Weighted- Average Grant Date Fair Value
Outstanding unvested at December 31, 2019	128,682	$	11.81
Granted	—	—
Vested	(28,166)	14.58
Forfeited/canceled	(9,148)	9.55
Outstanding unvested at September 30, 2020	91,368	$	11.19