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Employee Stock Purchase Plan (Details) - shares | 12 Months Ended |
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Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |  |
Number of shares covered under the Employee Stock Purchase Plan (ESPP) |  |  | 250,000
Purchase price per share as percentage of fair market value | 95.00% |  |
Issuance of shares under employee stock purchase plan (in shares) | 33,248 | 31,163 |
Shares available for future issuance under the ESPP | 172,082 |  |

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- Definition Number of shares issued during the period as a result of an employee stock purchase plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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