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Stockholders' Equity - (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Aug. 31, 2019
Sep. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Common stock reserved        
Net proceeds       $ 24,524
At-the-Market Sales Agreement        
Common stock reserved        
Maximum amount of shares for offering $ 25,000      
Maximum commission percentage 3.00%      
Net proceeds   $ 2,200 $ 2,200  
Number of shares sold     377,115  
Shares available for future issuance   $ 22,600 $ 22,600