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Revenue from Contracts with Customers Impact of adoption of ASC 606 on financial statements (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Oct. 01, 2017
Sep. 30, 2015
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                          
Notes receivable, current portion $ 5,183               $ 5,183        
Total current assets 116,795       $ 146,826       116,795 $ 146,826      
Notes receivable, less current portion 31,194               31,194        
Total assets 282,278       274,102       282,278 274,102 $ 297,159    
Deferred revenue 38,236               38,236        
Total current liabilities 92,462       86,389       92,462 86,389      
Total liabilities 155,633       148,326       155,633 148,326      
Retained deficit (31,555)       (30,832)       (31,555) (30,832)      
Total shareholders' equity 126,645       125,776       126,645 125,776 136,614   $ 113,475
Total liabilities and shareholders' equity 282,278       274,102       282,278 274,102      
Revenues 80,256 $ 74,890 $ 80,663 $ 81,156 81,329 $ 76,258 $ 82,497 $ 84,179 316,965 324,263 347,146    
Loss from operations (11,051) (11,800) (8,820) (3,604) (1,114) (2,784) 687 1,387 (35,275) (1,824) (18,623)    
Loss before income taxes                 (35,697) (2,731) (21,526)    
Net income (loss) (11,001) $ (11,713) $ (8,833) $ (1,135) $ (757) $ (3,917) $ (1,730) $ (1,724) (32,682) $ (8,128) $ (47,696)    
Calculated under Revenue Guidance in Effect before Topic 606 [Member]                          
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                          
Notes receivable, current portion 0               0        
Total current assets 111,612               111,612        
Notes receivable, less current portion 0               0        
Total assets 245,901               245,901        
Deferred revenue 36,828               36,828        
Total current liabilities 91,054               91,054        
Total liabilities 154,225               154,225        
Retained deficit (66,524)               (66,524)        
Total shareholders' equity 91,676               91,676        
Total liabilities and shareholders' equity 245,901               245,901        
Revenues                 319,206        
Loss from operations                 (33,034)        
Loss before income taxes                 (33,456)        
Net income (loss)                 (30,441)        
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]                          
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                          
Notes receivable, current portion (5,183)               (5,183)        
Total current assets (5,183)               (5,183)        
Notes receivable, less current portion (31,194)               (31,194)        
Total assets (36,377)               (36,377)        
Deferred revenue (1,408)               (1,408)        
Total current liabilities (1,408)               (1,408)        
Total liabilities (1,408)               (1,408)        
Retained deficit (34,969)               (34,969)     $ 37,200  
Total shareholders' equity (34,969)               (34,969)        
Total liabilities and shareholders' equity $ (36,377)               (36,377)        
Revenues                 2,241        
Loss from operations                 2,241        
Loss before income taxes                 2,241        
Net income (loss)                 $ 2,241