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Marketable Securities (Tables) | 9 Months Ended
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Jun. 30, 2018
Marketable Securities [Abstract] |
Marketable Securities | The amortized cost and fair value of marketable securities as of June 30, 2018 and September 30, 2017 were as follows:
| June 30, 2018
| Amortized cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value
| (in thousands)
Certificates of deposit | $ | 221 |  |  | $ | — |  |  | $ | (2 | ) |  | $ | 219 |
Corporate notes/bonds | 53,474 |  |  | — |  |  | (512 | ) |  | 52,962 |
U.S. government agency securities | 1,000 |  |  | — |  |  | (9 | ) |  | 991 |
| $ | 54,695 |  |  | $ | — |  |  | $ | (523 | ) |  | $ | 54,172 |
| 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 June 30, 2018 and September 30, 2017.
| June 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
| (in thousands)
Certificates of deposit | $ | 219 |  |  | $ | (2 | ) |  | $ | — |  |  | $ | — |  |  | $ | 219 |  |  | $ | (2 | )
Corporate notes/bonds | 31,516 |  |  | (358 | ) |  | 21,446 |  |  | (154 | ) |  | 52,962 |  |  | (512 | )
U.S. government agency securities | — |  |  | — |  |  | 991 |  |  | (9 | ) |  | 991 |  |  | (9 | )
| $ | 31,735 |  |  | $ | (360 | ) |  | $ | 22,437 |  |  | $ | (163 | ) |  | $ | 54,172 |  |  | $ | (523 | )
| 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 June 30, 2018 and September 30, 2017.
| June 30, 2018 |  | September 30, 2017
| Amortized cost |  | Fair value |  | Amortized cost |  | Fair value
| (in thousands) |  | (in thousands)
Due in one year or less | $ | 22,300 |  |  | $ | 22,170 |  |  | $ | 18,274 |  |  | $ | 18,244 |
Due after one year through three years | 32,395 |  |  | 32,002 |  |  | 32,184 |  |  | 32,071 |
| $ | 54,695 |  |  | $ | 54,172 |  |  | $ | 50,458 |  |  | $ | 50,315 |

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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26626-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2,12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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