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Nature of Operations and Summary of Significant Accounting Policies - Computation of Basic and Diluted Net Income (Loss) Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]                              
Net income $ 1,807 $ 2,985 $ 1,019 $ 2,167 $ 4,996 $ 1,348 $ 909 $ 561 $ 3,282 $ (99) $ (716) $ (3,191) $ 7,978 $ 7,814 $ (724)
Weighted-average shares outstanding—basic (in shares) 44,616 43,773 43,138 42,476 41,770 41,483 41,022 40,615 40,252 39,936 38,926 38,247 43,509 41,410 39,341
Common stock equivalents (in shares)                         1,574 1,123 0
Weighted-average shares outstanding—diluted (in shares) 46,236 45,194 44,554 43,897 43,101 42,428 42,028 41,828 41,635 39,936 38,926 38,247 45,083 42,533 39,341
Net income (loss) per share:                              
Net income per share—basic (in dollars per share) $ 0.04 $ 0.07 $ 0.02 $ 0.05 $ 0.12 $ 0.03 $ 0.02 $ 0.01 $ 0.08 $ 0 $ (0.02) $ (0.08) $ 0.18 $ 0.19 $ (0.02)
Net income per share—diluted (in dollars per share) $ 0.04 $ 0.07 $ 0.02 $ 0.05 $ 0.12 $ 0.03 $ 0.02 $ 0.01 $ 0.08 $ 0 $ (0.02) $ (0.08) $ 0.18 $ 0.18 $ (0.02)