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Marketable Securities | 3 Months Ended
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Dec. 31, 2016
Marketable Securities [Abstract] |
Marketable Securities | Marketable Securities The amortized cost and fair value of marketable securities as of December 31, 2016 and September 30, 2016 were as follows:
| December 31, 2016
| Amortized cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value
| (in thousands)
Certificates of deposit | $ | 881 |  |  | $ | — |  |  | $ | (1 | ) |  | $ | 880 |
Commercial paper | 11,972 |  |  | — |  |  | (8 | ) |  | 11,964 |
Corporate notes/bonds | 34,839 |  |  | — |  |  | (240 | ) |  | 34,599 |
US government agency securities | 2,402 |  |  | — |  |  | (11 | ) |  | 2,391 |
| $ | 50,094 |  |  | $ | — |  |  | $ | (260 | ) |  | $ | 49,834 |
| September 30, 2016
| Amortized cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value
| (in thousands)
Certificates of deposit | $ | 681 |  |  | $ | — |  |  | $ | — |  |  | $ | 681 |
Commercial paper | 11,945 |  |  | — |  |  | (20 | ) |  | 11,925 |
Corporate notes/bonds | 34,701 |  |  | — |  |  | (100 | ) |  | 34,601 |
US government agency securities | 2,411 |  |  | — |  |  | (2 | ) |  | 2,409 |
| $ | 49,738 |  |  | $ | — |  |  | $ | (122 | ) |  | $ | 49,616 |
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. The following table presents our available-for-sale marketable securities by contractual maturity date, as of December 31, 2016 and September 30, 2016.
| December 31, 2016 |  | September 30, 2016
| Amortized cost |  | Fair value |  | Amortized cost |  | Fair value
| (in thousands) |  | (in thousands)
Due in one year or less | $ | 22,650 |  |  | $ | 22,618 |  |  | $ | 18,585 |  |  | $ | 18,549 |
Due after one year through three years | 27,444 |  |  | 27,216 |  |  | 31,153 |  |  | 31,067 |
| $ | 50,094 |  |  | $ | 49,834 |  |  | $ | 49,738 |  |  | $ | 49,616 |

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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 -Glossary Debt Security -URI http://asc.fasb.org/extlink&oid=6509901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -Glossary Equity Security -URI http://asc.fasb.org/extlink&oid=6511694 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27405-111563 + Details
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