Quarterly report pursuant to Section 13 or 15(d)

Customer Concentrations and Accounts Receivable - Accounts Receivable (Details)

v3.19.3
Customer Concentrations and Accounts Receivable - Accounts Receivable (Details)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Sep. 20, 2019
USD ($)
Jun. 20, 2019
USD ($)
Mar. 20, 2019
USD ($)
Jun. 05, 2018
USD ($)
payment
Oct. 13, 2017
USD ($)
payment
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Mar. 31, 2015
USD ($)
Distribution and Accounts Receivable Assignment Agreements                      
Net bad debt expense (recovery)           $ (100) $ 100 $ (77) $ 55    
BPC                      
Distribution and Accounts Receivable Assignment Agreements                      
Accounts receivable           4,800   4,800     $ 8,100
Total collections on accounts receivable allowance           1,800   1,800      
Accounts Receivable Assignment Agreement | Turbine International, LLC                      
Distribution and Accounts Receivable Assignment Agreements                      
Total consideration receivable         $ 2,500            
Number of payments to be received | payment         3            
Reduction in accounts receivable allowances                   $ 1,000  
Payments due $ 300 $ 300 $ 400                
Total collections on accounts receivable allowance           $ 1,500   $ 1,500      
Promissory Note Agreement | Turbine International, LLC                      
Distribution and Accounts Receivable Assignment Agreements                      
Total consideration receivable         $ 3,800            
Number of payments to be received | payment         35            
Term of payments         3 years            
Amended Assignment Agreement | Turbine International, LLC                      
Distribution and Accounts Receivable Assignment Agreements                      
Total consideration receivable       $ 1,500              
Number of payments to be received | payment       5              
Amended Note Agreement | Turbine International, LLC                      
Distribution and Accounts Receivable Assignment Agreements                      
Total consideration receivable       $ 3,800              
Number of payments to be received | payment       13              
Term of payments       3 years