Annual report pursuant to Section 13 and 15(d)

Equity-based Compensation - Option Pricing Model (Details)

v3.10.0.1
Equity-based Compensation - Option Pricing Model (Details) - Options
12 Months Ended
Sep. 30, 2018
$ / shares
2017 Non-Plan Option  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Risk-free rate 2.04%
Expected term (in years) 5 years
Expected volatility 50.00%
Expected dividend yield 0.00%
Value of underlying stock (in dollars per share) $ 5.56
2016 Equity Incentive Plan  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Risk-free rate 1.31%
Expected term (in years) 6 years
Expected volatility 50.00%
Expected dividend yield 0.00%
Value of underlying stock (in dollars per share) $ 4.97