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Mezzanine and Stockholders' Equity - Summary of Warrant (Details) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Shares    
Warrants outstanding, beginning balance (in shares) 3,154,590  
Warrants granted (in shares) 0  
Warrants exercised (in shares) (273,900)  
Warrants expired/forfeited (in shares) 0  
Warrants outstanding, ending balance (in shares) 2,880,690 3,154,590
Weighted Average Exercise Price    
Warrants outstanding, beginning balance (in dollars per share) $ 9.96  
Warrants granted (in dollars per share) 0  
Warrants exercised (in dollars per share) 9.32  
Warrants expired/forfeited (in dollars per share) 0  
Warrants outstanding, ending balance (in dollars per share) $ 10.02 $ 9.96
Weighted Average Remaining Contractual Term (Years)    
Warrants outstanding 1 year 7 months 9 days 2 years 3 days
Aggregate Intrinsic Value (in thousands)    
Warrants outstanding, beginning balance $ 26,700  
Warrants granted 0  
Warrants exercised 2,000  
Warrants expired/forfeited 0  
Warrants outstanding, ending balance $ 18,700 $ 26,700