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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, 2017
Sep. 30, 2017
Number of Shares    
Outstanding at the beginning of the period (in shares) 1,994  
Granted (in shares) 217  
Exercised (in shares) (25)  
Outstanding at the end of the period (in shares) 2,186 1,994
Weighted Average Exercise Price    
Outstanding at the beginning of the period (in dollars per share) $ 3.83  
Outstanding at the end of the period (in dollars per share) $ 4.37 $ 3.83
Weighted Average Remaining Contractual Term    
Weighted Average Remaining Contractual Term 6 years 11 months 12 days 6 years 4 months 24 days
Aggregate Intrinsic Value    
Outstanding at the beginning of the period (in dollars) $ 8,489  
Outstanding at the end of the period (in dollars) $ 7,799 $ 8,489