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Basis of Presentation of Unaudited Interim Condensed Consolidated Financial Statements and Significant Accounting Policies - ASC 606 Income Statement (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Revenue:    
Total Revenue $ 62,313 $ 44,955 [1]
Cost of sales:    
Amortization 740 607 [1]
Total cost of sales 32,530 22,996 [1]
Gross profit 29,783 21,959 [1]
Operating expenses 24,225 23,958 [1]
Operating income (loss) 5,558 (1,999) [1]
Net loss $ 4,682 $ (4,487) [1]
Diluted loss (USD per share) $ 0.17 $ (0.17) [1]
Product    
Revenue:    
Revenue $ 50,812 $ 38,454 [1]
Cost of sales:    
Cost of sales excluding amortization 25,813 19,210 [1]
Services and Solutions    
Revenue:    
Revenue 11,501 6,501 [1]
Cost of sales:    
Cost of sales excluding amortization $ 5,977 3,179 [1]
As Reported    
Revenue:    
Total Revenue   45,197
Cost of sales:    
Amortization   607
Total cost of sales   23,260
Gross profit   21,937
Operating expenses   24,060
Operating income (loss)   (2,123)
Net loss   $ (4,569)
Diluted loss (USD per share)   $ (0.17)
As Reported | Product    
Revenue:    
Revenue   $ 38,454
Cost of sales:    
Cost of sales excluding amortization   19,210
As Reported | Services and Solutions    
Revenue:    
Revenue   6,743
Cost of sales:    
Cost of sales excluding amortization   3,443
ASU 2014-09 | Impact of Adoption    
Revenue:    
Total Revenue   (242)
Cost of sales:    
Amortization   0
Total cost of sales   (264)
Gross profit   22
Operating expenses   (102)
Operating income (loss)   124
Net loss   $ 82
Diluted loss (USD per share)   $ 0.00
ASU 2014-09 | Impact of Adoption | Product    
Revenue:    
Revenue   $ 0
Cost of sales:    
Cost of sales excluding amortization   0
ASU 2014-09 | Impact of Adoption | Services and Solutions    
Revenue:    
Revenue   (242)
Cost of sales:    
Cost of sales excluding amortization   $ (264)
[1] Prior period information has been restated for the adoption of ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606),” which we adopted on October 1, 2018.