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Stock-based Compensation, Equity Grants, and Warrants - Stock Option Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Number of Shares    
Outstanding at the beginning of the period (in shares) 2,134  
Granted (in shares) 0  
Exercised (in shares) (35)  
Outstanding at the end of the period (in shares) 2,099 2,134
Weighted Average Exercise Price    
Outstanding at the beginning of the period (in dollars per share) $ 4.31  
Granted (in dollars per share) 0.00  
Exercised (in dollars per share) 1.12  
Outstanding at the end of the period (in dollars per share) $ 4.33 $ 4.31
Weighted Average Remaining Contractual Term    
Weighted Average Remaining Contractual Term 6 years 2 months 12 days 6 years 3 months 18 days
Aggregate Intrinsic Value    
Outstanding at the beginning of the period (in dollars) $ 6,949  
Outstanding at the end of the period (in dollars) $ 5,103 $ 6,949