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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ 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:    
Sales and marketing 11,657 9,760 [1]
Research and development 9,518 7,751 [1]
General and administrative 3,117 6,447 [1]
Restructuring reversal (67) 0
Total operating expenses 24,225 23,958 [1]
Operating income (loss) 5,558 (1,999) [1]
Other income, net:    
Interest income 208 208 [1]
Interest expense (92) (3) [1]
Other income (expense), net 48 (45) [1]
Total other income, net 164 160 [1]
Income (loss) before income taxes 5,722 (1,839) [1]
Income tax provision 1,040 2,648 [1]
Net income (loss) $ 4,682 $ (4,487) [1]
Basic net income (loss) per common share:    
Net income (loss), basic (USD per share) $ 0.17 $ (0.17) [1]
Diluted net income (loss) per common share    
Net income (loss), diluted (USD per share) $ 0.17 $ (0.17) [1]
Weighted average common shares:    
Basic (shares) 27,513 26,748 [1]
Diluted (shares) 28,075 26,748 [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]
[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.