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Marketable Securities | 6 Months Ended
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Mar. 31, 2018
Marketable Securities [Abstract] |
Marketable Securities | 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 |
Our investment portfolio consists of certificates of deposit, commercial paper, corporate notes/bonds and government securities that have a maximum maturity of three years. The longer the duration of these securities, the more susceptible they are to changes in market interest rates and bond yields. All unrealized losses are due to changes in market interest rates, bond yields and/or credit ratings. We review our investments to identify and evaluate investments that have an indication of possible impairment. We concluded that, at March 31, 2018, the unrealized losses were temporary. 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 | )
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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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=4738149 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2289146 + Details
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