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Marketable Securities (Tables) | 6 Months Ended
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Mar. 31, 2018
Marketable Securities [Abstract] |
Marketable Securities | The amortized cost and fair value of marketable securities as of March 31, 2018 and September 30, 2017 were as follows:
| March 31, 2018
| Amortized cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value
| (in thousands)
Certificates of deposit | $ | 220 |  |  | $ | — |  |  | $ | (1 | ) |  | $ | 219 |
Corporate notes/bonds | 53,225 |  |  | — |  |  | (575 | ) |  | 52,650 |
U.S. government agency securities | 2,408 |  |  | — |  |  | (13 | ) |  | 2,395 |
| $ | 55,853 |  |  | $ | — |  |  | $ | (589 | ) |  | $ | 55,264 |
| September 30, 2017
| Amortized cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value
| (in thousands)
Certificates of deposit | $ | 240 |  |  | $ | — |  |  | $ | — |  |  | $ | 240 |
Corporate notes/bonds | 47,811 |  |  | 2 |  |  | (140 | ) |  | 47,673 |
U.S. government agency securities | 2,407 |  |  | — |  |  | (5 | ) |  | 2,402 |
| $ | 50,458 |  |  | $ | 2 |  |  | $ | (145 | ) |  | $ | 50,315 |
Unrealized Gain (Loss) on Investments | 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 March 31, 2018 and September 30, 2017.
| March 31, 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
| (in thousands)
Certificates of deposit | $ | 219 |  |  | $ | (1 | ) |  | $ | — |  |  | $ | — |  |  | $ | 219 |  |  | $ | (1 | )
Corporate notes/bonds | 30,712 |  |  | (413 | ) |  | 21,938 |  |  | (162 | ) |  | 52,650 |  |  | (575 | )
U.S. government agency securities | — |  |  | — |  |  | 2,395 |  |  | (13 | ) |  | 2,395 |  |  | (13 | )
| $ | 30,931 |  |  | $ | (414 | ) |  | $ | 24,333 |  |  | $ | (175 | ) |  | $ | 55,264 |  |  | $ | (589 | )
| September 30, 2017
| Less than twelve months |  | Greater than twelve months |  | Total
| Fair Value |  | Gross unrealized loss |  | Fair Value |  | Gross unrealized loss |  | Fair Value |  | Gross unrealized loss
| (in thousands)
Certificates of deposit | $ | 240 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 240 |  |  | $ | — |
Corporate notes/bonds | 15,254 |  |  | (43 | ) |  | 28,885 |  |  | (97 | ) |  | 44,139 |  |  | (140 | )
U.S. government agency securities | — |  |  | — |  |  | 2,402 |  |  | (5 | ) |  | 2,402 |  |  | (5 | )
| $ | 15,494 |  |  | $ | (43 | ) |  | $ | 31,287 |  |  | $ | (102 | ) |  | $ | 46,781 |  |  | $ | (145 | )
Investments Classified by Contractual Maturity Date | The following table presents our available-for-sale marketable securities by contractual maturity date as of March 31, 2018 and September 30, 2017.
| March 31, 2018 |  | September 30, 2017
| Amortized cost |  | Fair value |  | Amortized cost |  | Fair value
| (in thousands) |  | (in thousands)
Due in one year or less | $ | 22,772 |  |  | $ | 22,636 |  |  | $ | 18,274 |  |  | $ | 18,244 |
Due after one year through three years | 33,081 |  |  | 32,628 |  |  | 32,184 |  |  | 32,071 |
| $ | 55,853 |  |  | $ | 55,264 |  |  | $ | 50,458 |  |  | $ | 50,315 |

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