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Mezzanine and Stockholders' Equity - Schedule of Stock Options Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Shares      
Options outstanding, beginning balance (in shares) 607,346    
Options granted (in shares) 11,742    
Options exercised (in shares) (120,000) (111,000)  
Options forfeited (in shares) (12,228)    
Options outstanding, ending balance (in shares) 486,860   607,346
Options exercisable (in shares) 380,894    
Weighted Average Exercise Price      
Options outstanding, beginning balance (in dollars per share) $ 9.22    
Options granted (in dollars per share) 18.41    
Options exercised (in dollars per share) 2.58    
Options forfeited (in dollars per share) 17.57    
Options outstanding, ending balance (in dollars per share) 10.86   $ 9.22
Options exercisable (in dollars per share) $ 7.11    
Weighted Average Remaining Contractual Term (Years)      
Options outstanding 3 years 8 months 12 days   3 years 5 months 1 day
Options exercisable 2 years 8 months 26 days    
Aggregate Intrinsic Value (in thousands)      
Beginning balance $ 5,600    
Options exercised 1,800    
Ending balance 2,900   $ 5,600
Options exercisable $ 3,000