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Stockholders' Equity (Tables)
12 Months Ended
Dec. 31, 2020
Stockholders' Equity  
Schedule of Share-based Payment Arrangement, Nonemployee Director Award Plan, Activity

    

Shares Available

Compensation

(in thousands)

for Grant

Cost

Balance, December 31, 2016, 2017 and 2018

1,944,428

Shares granted 2019

(38,046)

$

337,000

Balance December 31, 2019

1,906,382

337,000

Shares granted 2020

(58,998)

337,000

Balance December 31, 2020

1,847,384

$

674,000