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Quarterly Financial Data (Unaudited) - Additional Information (Detail) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Aug. 31, 2019 | Dec. 31, 2017 | 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, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discrete tax expense |  |  |  |  |  |  |  |  |  | $ 1,200 |  |  | $ 1,600 |
U.S. federal statutory tax rate |  | 21.00% |  |  |  |  |  |  |  | 35.00% |  | 21.00% | 24.50% | 35.00%
Total revenue |  |  | $ 30,816 | $ 24,344 | $ 22,676 | $ 22,241 | $ 23,038 | $ 22,227 | $ 19,058 | $ 17,013 |  | $ 100,077 | $ 81,336 | $ 73,112
Intellectual Property [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire intellectual property assets |  |  | 900 |  |  |  |  |  |  |  |  |  |  |
Embolitech LLC [Member] | Intellectual Property [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire intellectual property assets |  |  |  |  |  |  |  | $ 7,900 |  |  |  | 5,000 |  |
Abbott [Member] | Clinical [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recognized Revenue |  |  | $ 5,100 |  |  |  |  |  |  |  |  |  |  |
Milestone payment received | $ 10,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Royalties and License Fees [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  | $ 1,000 |  |  |  |  |  |  |  | $ 48,458 | $ 35,424 | $ 31,787
Royalties and License Fees [Member] | Abbott [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  |  | $ 4,400 |  |  |

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