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Segment Information - Reconciliation from Segments to Consolidated (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Segment Reporting [Abstract] |  |  |  |  |  |  |  |  |  |  |
Gross profit | $ 29,038 | $ 28,551 | $ 29,218 | $ 26,473 | $ 24,857 | $ 27,144 | $ 27,511 | $ 30,200 | $ 113,280 | $ 109,712 | $ 124,490
Operating expenses |  |  |  |  |  |  |  |  | 127,739 | 130,048 | 161,083
Other operating expenses |  |  |  |  |  |  |  |  | 5,049 | 1,392 | 3,651
Interest (income) expense and other expense, net |  |  |  |  |  |  |  |  | (1,448) | (785) | (606)
Loss before provision for income taxes | $ (5,163) | $ (4,107) | $ (4,034) | $ (4,756) | $ (6,547) | $ (3,093) | $ (5,276) | $ (6,027) | $ (18,060) | $ (20,943) | $ (39,638)

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