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Marketable Securities (Tables) | 12 Months Ended
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Sep. 30, 2019
Investments, Debt and Equity Securities [Abstract] |
Marketable Securities | The amortized cost and fair value of marketable securities as of September 30, 2019 and 2018 were as follows:
(in thousands) | September 30, 2019
| Amortized cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value
Commercial paper | 999 |  |  | — |  |  | — |  |  | 999 |
Corporate notes/bonds | 56,318 |  |  | 146 |  |  | (28 | ) |  | 56,436 |
| $ | 57,317 |  |  | $ | 146 |  |  | $ | (28 | ) |  | $ | 57,435 |
(in thousands) | September 30, 2018
| Amortized cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value
Certificates of deposit | $ | 220 |  |  | $ | — |  |  | $ | (1 | ) |  | $ | 219 |
Corporate notes/bonds | 55,140 |  |  | — |  |  | (403 | ) |  | 54,737 |
U.S. government agency securities | 1,004 |  |  | — |  |  | (9 | ) |  | 995 |
| $ | 56,364 |  |  | $ | — |  |  | $ | (413 | ) |  | $ | 55,951 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Table Text Block] | The following tables summarize the fair value and gross unrealized losses aggregated by category and the length of time that individual securities have been in a continuous unrealized loss position as of September 30, 2019 and 2018.
(in thousands) | September 30, 2019
| Less than twelve months |  | Greater than twelve months |  | Total
| Fair Value |  | Gross unrealized loss |  | Fair Value |  | Gross unrealized loss |  | Fair Value |  | Gross unrealized loss
Corporate notes/bonds | $ | 12,419 |  |  | $ | (14 | ) |  | $ | 16,369 |  |  | $ | (14 | ) |  | $ | 28,788 |  |  | $ | (28 | )
(in thousands) | September 30, 2018
| Less than twelve months |  | Greater than twelve months |  | Total
| Fair Value |  | Gross unrealized loss |  | Fair Value |  | Gross unrealized loss |  | Fair Value |  | Gross unrealized loss
Certificates of deposit | $ | 219 |  |  | $ | (1 | ) |  | $ | — |  |  | $ | — |  |  | $ | 219 |  |  | $ | (1 | )
Corporate notes/bonds | 24,067 |  |  | (70 | ) |  | 30,670 |  |  | (333 | ) |  | 54,737 |  |  | (403 | )
US government agency securities | — |  |  | — |  |  | 995 |  |  | (9 | ) |  | 995 |  |  | (9 | )
| $ | 24,286 |  |  | $ | (71 | ) |  | $ | 31,665 |  |  | $ | (342 | ) |  | $ | 55,951 |  |  | $ | (413 | )
Investments Classified by Contractual Maturity Date | The following table presents our available-for-sale marketable securities by contractual maturity date, as of September 30, 2019 and 2018.
(in thousands) | September 30, 2019 |  | September 30, 2018
| Amortized cost |  | Fair value |  | Amortized cost |  | Fair value
Due in one year or less | $ | 27,725 |  |  | $ | 27,735 |  |  | $ | 25,792 |  |  | $ | 25,670 |
Due after one year through three years | 29,592 |  |  | 29,700 |  |  | 30,572 |  |  | 30,281 |
| $ | 57,317 |  |  | $ | 57,435 |  |  | $ | 56,364 |  |  | $ | 55,951 |

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- Definition Tabular disclosure of fair value of investments in debt and equity securities in an unrealized loss position categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
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- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References No definition available. + Details
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