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QUARTERLY INFORMATION (UNAUDITED)
12 Months Ended
Sep. 30, 2018
Quarterly Financial Information Disclosure [Abstract]  
QUARTERLY INFORMATION (UNAUDITED) QUARTERLY INFORMATION (UNAUDITED)
The following table sets forth selected quarterly financial data for 2018, 2017, and 2016 (shown in thousands except per share data):
2018
Revenue $12,136 $14,277 $16,109 $21,037 
Cost of revenue
1,617 1,717 2,678 2,674 
Operating expenses 12,831 13,825 16,294 19,729 
Operating loss (2,312)(1,265)(2,863)(1,366)
Other income (expense), net 190 204 (1,351)22 
Income tax benefit (provision)
(3,614)(99)1,430 (783)
Net loss $(5,736)$(1,160)$(2,784)$(2,127)
Net loss per share: 
Net loss per share—basic
$(0.17)$(0.03)$(0.08)$(0.06)
Shares used in calculating net loss per share—basic
34,207 34,976 36,190 37,858 
Net loss per share—diluted
$(0.17)$(0.03)$(0.08)$(0.06)
Shares used in calculating net loss per share—diluted
34,207 34,976 36,190 37,858 

2017
Revenue $9,269 $11,419 $11,798 $12,904 
Cost of revenue
891 830 1,182 1,138 
Operating expenses 9,050 9,365 10,132 10,033 
Operating income (loss)
(672)1,224 484 1,733 
Other income, net 65 67 149 121 
Income tax benefit (provision)
— (74)(17)11,012 
Net income (loss) $(607)$1,217 $616 $12,866 
Net income (loss) per share:
Net income (loss) per share—basic
$(0.02)$0.04 $0.02 $0.38 
Shares used in calculating net income (loss) per share—basic
32,377 32,786 33,024 33,522 
Net income (loss) per share—diluted
$(0.02)$0.03 $0.02 $0.35 
Shares used in calculating net income (loss) per share—diluted
32,377 34,815 35,610 36,251 
2016
Revenue $7,404 $8,522 $9,105 $9,670 
Cost of revenue
942 720 793 940 
Operating expenses 6,804 7,171 7,618 7,889 
Operating income (loss) (342)631 694 841 
Other income, net 36 30 45 23 
Income tax benefit (provision)
(16)(79)— 96 
Net income (loss) $(322)$582 $739 $960 
Net income (loss) per share: 
Net income (loss) per share—basic
$(0.01)$0.02 $0.02 $0.03 
Shares used in calculating net income (loss) per share—basic
31,094 31,326 31,823 32,086 
Net income (loss) per share—diluted
$(0.01)$0.02 $0.02 $0.03 
Shares used in calculating net income (loss) per share—diluted
31,094 33,134 34,532 34,860