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Summary of Significant Accounting Policies (Details)
$ in Thousands
12 Months Ended
Oct. 01, 2019
USD ($)
Sep. 30, 2019
USD ($)
reportable_unit
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Concentration Risk [Line Items]          
Cash and cash equivalents on consolidated balance sheet   $ 1,119 $ 572    
Restricted cash   2,081 665    
Total cash and cash equivalents on consolidated statement of cash flows   3,200 1,237 $ 1,968 $ 4,189
Allowance for doubtful accounts   232 205    
Settlement assets   0 863    
Inventories     1,294 930  
Impairment charges   0 0 0  
Goodwill impairment   0 0 0  
Amortization expense of intangible assets   12,394 9,341 $ 7,669  
Revenue from acquisitions   27,820      
Net income from acquisitions   (2,229)      
Discount fees as percent of gross revenue (percent)       85.00%  
Advertising expense   1,443 765 $ 654  
Equity-based compensation expense   $ 6,124 1,567 0  
Number of reporting units | reportable_unit   9      
Change in fair value of warrant liability   $ 0 $ 8,487 $ (415)  
Forecast          
Concentration Risk [Line Items]          
Cumulative increase to retained earnings $ 1,821        
Intangible Assets, Amortization Period          
Concentration Risk [Line Items]          
Amortization expense of intangible assets   $ 1,290      
Product Concentration Risk | Gross Revenue          
Concentration Risk [Line Items]          
Discount fees as percent of gross revenue (percent)       85.00%