Annual report pursuant to Section 13 and 15(d)

Stock-based Compensation - Summary of Outstanding RSU's (Details)

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Stock-based Compensation - Summary of Outstanding RSU's (Details) - Restricted Stock Unit - shares
12 Months Ended
Apr. 10, 2019
Dec. 31, 2019
Dec. 31, 2018
RSU's      
Outstanding at January 1, 2018   249,500  
Granted 128,000   287,500
Forfeited   (38,000) (38,000)
Outstanding at December 31, 2018   90,000 249,500