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Share-based Compensation (Tables)
6 Months Ended
Jun. 30, 2020
Share-based Payment Arrangement [Abstract]  
Nonvested Restricted Stock Shares Activity [Table Text Block]

Weighted

Number of

Average Grant

    

Units

    

Date Fair Value

Unvested at December 31, 2019

 

908,088

$

8.73

Granted

 

1,010,461

5.01

Vested

 

(209,627)

 

9.06

Forfeited

 

(55,952)

 

6.84

Unvested at June 30, 2020

 

1,652,970

$

6.48

Share-based Payment Arrangement, Option, Activity [Table Text Block]

Weighted

Number of

Average Grant

    

Units

    

Date Fair Value

Unvested at December 31, 2019

 

359,259

$

4.95

Vested

(87,476)

5.05

Forfeited/Canceled

(42,515)

5.00

Unvested at June 30, 2020

 

229,268

$

4.90

Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]

Number of

Weighted

    

Units

    

Average

Unvested at December 31, 2019

 

842,888

$

2.14

Vested

(213,197)

2.12

Unvested at June 30, 2020

629,691

$

2.15