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Equity (Tables)

12 Months Ended

Dec. 31, 2021

Equity Incentive Plan [Member]

Schedule of share-based compensation activity

​

Ending balances of the Plans are as follows:

​

​	​	​	​	​
​	​	December 31,
(in thousands)		2021		2020
Outstanding options and restricted stock units		3,076		2,697
Reserved but unissued shares under the Plans	​	2,901	​	1,217
Total authorized shares under the Plans		5,977		3,914

Warrant [Member]

Schedule Of warrant activity

A summary of warrant activity and related information is as follows:

​

​	​	​	​	​	​	​	​	​	​	​
​	​	December 31,
​	​	2021				​	2020
​		​		Weighted			​		Weighted
​	​	​	​	Average		​	​	​	Average
​	​	​	​	Exercise		​	​	​	Exercise
(in thousands)	​	Warrants	​	Price		​	Warrants	​	Price
Outstanding at January 1		80	​	$	1.80		80	​	$	1.80
Granted		—	​		—		—	​	​	—
Exercised		(38)	​		1.80		—	​		—
Forfeited/Expired		(43)	​	​	1.80		—	​	​	—
Outstanding at December 31		—	​	$	—		80	​	$	1.80

Stock options

Schedule of weighted-average assumptions used in calculation of fair value of stock options

​

The following weighted-average assumptions were utilized in the calculation of the fair value of stock options:

​

​	​	​	​	​	​
​	​	December 31,			​
​	​	2021	​	2020	​
Expected life		6.01 years		6.98 years	​
Weighted average volatility	​	91.89	%	76.50	%
Weighted average risk-free interest rate	​	0.59	%	1.26	%
Expected dividend rate	​	0	%	0	%

Schedule of stock option activity

A summary of the Company’s stock option activity and changes is as follows:

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​

​

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​

​

​

​

​

​

​

​

​

​

December 31,

​

​

2021

​

2020

​

​

​

​

​

​

​

Weighted

​

​

​

​

​

​

Weighted

​

​

​

​

​

​

​

Average

​

​

​

​

​

​

Average

​

​

Options to

​

Weighted

​

Remaining

​

Options to

​

Weighted

​

Remaining

​

​

Purchase

​

Average

​

Contractual

​

Purchase

​

Average

​

Contractual

​

​

Common

​

Exercise

​

Life (in

​

Common

​

Exercise

​

Life (in

(in thousands)

Stock

Price

years)

Stock

Price

years)

Outstanding at January 1

2,697

​

$

2.18

7.53

2,131

​

$

2.53

7.99

Granted

1,065

​

$

3.15

8.40

743

​

$

1.07

9.23

Exercised

(327)

​

$

1.41

—

(117)

​

$

1.08

—

Forfeited/Expired/Exchanged

(471)

​

$

5.70

—

(60)

​

$

2.88

—

Outstanding at December 31

2,964

​

$

2.06

6.89

2,697

​

$

2.18

7.53

Exercisable at December 31

2,178

​

$

1.72

6.20

2,380

​

$

2.26

7.48

​

Consultant Stock Plan

Schedule of share-based compensation activity

​

​	​	​	​	​
​	​	December 31,
(in thousands)		2021		2020
Reserved but unissued shares January 1	​	212	​	190
Increases in the number of authorized shares	​	14	​	33
Grants	​	(15)	​	(11)
Reserved but unissued shares December 31	​	211	​	212

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