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Summary of Significant Accounting Policies - Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Effect on income before income taxes | $ (319) | $ (342)
Effect on income taxes | 35 | 48
Effect on net income | $ (284) | $ (294)
Stock Options |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |
Outstanding at beginning of period (in shares) | 1,841,567 | 1,627,477
Granted (in shares) | 100,000 | 344,075
Exercised (in shares) | (180) | 0
Forfeited (in shares) | (55,446) | (33,642)
Outstanding at end of period (in shares) | 1,885,941 | 1,937,910
Exercisable at end of period (in shares) | 1,375,174 | 1,189,855
Weighted average fair value of options granted during the period (usd per share) | $ 2.88 | $ 3.03
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward] |  |
Outstanding at beginning of period, Weighted Average Exercise Price (usd per share) | 8.15 | 9.11
Granted, Weighted Average Exercise Price (usd per share) | 4.99 | 5.25
Exercised, Weighted Average Exercise Price (usd per share) | 3.80 | 0.00
Forfeited, Weighted Average Exercise Price (usd per share) | 13.34 | 14.90
Outstanding at end of period, Weighted Average Exercise Price (usd per share) | 7.84 | 8.34
Exercisable at end of period, Weighted Average Exercise Price (usd per share) | $ 8.26 | $ 9.21
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] |  |
Risk free interest rate | 2.00% | 2.00%
Expected life | 6 years | 6 years
Dividend rate | 0.00% | 0.00%
Volatility | 62.00% | 62.00%
Stock Options | Maximum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Option expiration period | 10 years |
Option vesting period | 4 years |
Stock Options | Minimum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Option vesting period | 6 months |
Restricted Stock |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |
Beginning Outstanding (in shares) | 0 | 13,540
Released (in shares) | 0 | (13,540)
Ending Outstanding (in shares) | 0 | 0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward] |  |
Beginning Outstanding, Weighted Average Grant Date Fair Value (usd per share) | $ 0.00 | $ 7.98
Released, Weighted Average Grant Date Fair Value (usd per share) | 0.00 | 7.98
Ending Outstanding, Weighted Average Grant Date Fair Value (usd per share) | $ 0.00 | $ 0.00
Restricted Stock | Maximum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Option vesting period | 4 years |
Restricted Stock | Minimum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Option vesting period | 2 years |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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