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Stockholders' Equity - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Dec. 31, 2019
Mar. 31, 2019
Sep. 30, 2019
Number of Shares      
Outstanding at September 30, 2019 (in shares) 1,686,902    
Granted (in shares) 0    
Exercised (in shares) (23,318)    
Canceled (in shares) (3,000)    
Outstanding at December 31, 2019 (in shares) 1,660,584    
Weighted-Average Exercise Price      
Outstanding at September 30, 2019 (in dollars per share) $ 7.00    
Granted (in dollars per share) 0    
Exercised (in dollars per share) 3.06    
Canceled (in dollars per share) 6.60    
Outstanding at December 31, 2019 (in dollars per share) $ 7.06    
Weighted-Average Remaining Contractual Term (in Years)      
Outstanding 5 years 2 months 12 days 5 years 4 months 24 days  
Outstanding, Aggregate Intrinsic Value $ 3,094   $ 4,882
Vested and Expected to Vest      
Outstanding at December 31, 2019 (in shares) 1,660,584    
Weighted Average Exercise Price (in dollars per share) $ 7.06    
Weighted Average Remaining Contractual Term (in Years) 5 years 2 months 12 days    
Aggregate Intrinsic Value $ 3,094    
Exercisable      
Exercisable at December 31, 2019 (in shares) 1,271,464    
Exercisable, Weighted Average Exercise Price (in dollars per share) $ 6.36    
Exercisable, Weighted Average Remaining Contractual Term (in Years) 4 years 2 months 12 days    
Exercisable, Aggregate Intrinsic Value $ 3,077