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STOCK-BASED COMPENSATION (Tables)
6 Months Ended
Jun. 30, 2020
Summary of Stock option and restricted stock activity

A summary of stock option and restricted stock activity under the 2008 Plan during the six months ended June 30, 2020 and 2019 is presented below:

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​

​

​

​

​

​

​

(in thousands)

​

Options

​

​

RSAs

​

Outstanding at December 31, 2018

 

759

​

​

117

​

Granted

 

160

​

​

122

​

Options Exercised/RSAs Vested

 

(114)

​

​

(42)

 (1)

Forfeited

 

(18)

​

​

(2)

​

Expired

 

(1)

​

​

—

​

Outstanding at June 30, 2019

 

786

​

​

195

​

​

​

​

​

​

​

​

Outstanding at December 31, 2019

 

757

​

​

192

​

Granted

 

7

​

​

261

​

Options Exercised/RSAs Vested

 

(8)

​

​

(121)

 (2)

Forfeited

 

(13)

​

​

(17)

​

Expired

 

—

​

​

—

​

Outstanding at June 30, 2020

 

743

​

​

315

​

(1)Includes 15 thousand shares purchased from employees to cover employee income taxes related to income earned upon vesting of restricted stock. The shares purchased are held in treasury and the $1.0 million total purchase price for the shares is included in Treasury stock in our accompanying unaudited interim condensed consolidated balance sheets.
(2)Includes 43 thousand shares purchased from employees to cover employee income taxes related to income earned upon vesting of restricted stock. The shares purchased are held in treasury and the $1.6 million total purchase price for the shares is included in Treasury stock in our accompanying unaudited interim condensed consolidated balance sheets.
Employee Stock Purchase Plan 2016 [Member]  
Summary of allocated expense

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​

​

​

​

​

​

​

​

​

​

​

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(in thousands)

​

Three Months Ended June 30, 

​

Six Months Ended June 30, 

​

​

    

2020

    

2019

    

2020

    

2019

    

Cost of sales

​

$

7

​

$

3

​

$

11

​

$

6

​

Research and development

​

 

12

​

 

4

​

 

19

​

 

9

​

Selling, general, and administrative

​

 

38

​

 

23

​

 

56

​

 

45

​

​

​

$

57

​

$

30

​

$

86

​

$

60

​

Stock Incentive Plan 2008 [Member]  
Summary of allocated expense

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​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Three Months Ended June 30, 

​

Six Months Ended June 30, 

​

(in thousands)

    

2020

    

2019

    

2020

    

2019

    

Cost of sales

​

$

33

​

$

28

​

$

59

​

$

49

​

Research and development

​

 

146

​

 

219

​

 

333

​

 

332

​

Selling, general, and administrative

​

 

5,500

​

 

2,316

​

 

7,682

​

 

3,862

​

​

​

$

5,679

​

$

2,563

​

$

8,074

​

$

4,243

​