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Stock-Based Compensation - Narrative (Details) | 1 Months Ended | 3 Months Ended | 9 Months Ended
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May 31, 2015 shares | Jun. 30, 2010 USD ($) item | Sep. 30, 2017 USD ($) shares | Mar. 31, 2017 shares | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) shares | Sep. 30, 2016 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract] |  |  |  |  |  |  |
Options granted (in shares) | shares |  |  | 0 |  |  |  |
Options |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract] |  |  |  |  |  |  |
Unamortized compensation cost, net of expected forfeitures | $ |  |  | $ 1,100,000 |  |  | $ 1,100,000 |
Weighted average expected period over which the expense is to be recognized |  |  |  |  |  | 1 year 10 months 24 days |
Tax benefits associated with exercise of stock options | $ |  |  | 0 |  | $ 0 | $ 0 | $ 0
Stock options exercised | shares |  |  |  |  |  | 0 | 0
RSU's |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract] |  |  |  |  |  |  |
Weighted average expected period over which the expense is to be recognized |  |  |  |  |  | 1 year 4 months 24 days |
Unamortized compensation cost for awards other than options, net of expected forfeitures | $ |  |  | 600,000 |  |  | $ 600,000 |
Cash paid for employee income tax related to settlement of RSUs | $ |  |  |  |  |  | 22,000 |
Total intrinsic value of the restricted stock units outstanding | $ |  |  | $ 400,000 |  |  | $ 400,000 |
RSU's | Minimum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract] |  |  |  |  |  |  |
Stock-based compensation expense, recognition period |  |  |  |  |  | 3 years |
RSU's | Maximum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract] |  |  |  |  |  |  |
Stock-based compensation expense, recognition period |  |  |  |  |  | 5 years |
Employee stock purchase plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract] |  |  |  |  |  |  |
Increase in number of shares reserved for issuance | shares | 200,000 |  |  |  |  |  |
Number of offering periods | item |  | 2 |  |  |  |  |
Offering period |  | 6 months |  |  |  |  |
Purchase price to be paid by participants as a percentage of price per share either at the beginning or the end of each six-month offering period, whichever is less |  | 85.00% |  |  |  |  |
Employee stock purchase plan | Maximum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract] |  |  |  |  |  |  |
Maximum amount of shares that eligible employee may purchase annually (in dollars) | $ |  | $ 25,000 |  |  |  |  |
Amended and Restated 2010 Equity Incentive Plan [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract] |  |  |  |  |  |  |
Increase in number of shares reserved for issuance | shares |  |  |  | 50,000 |  |  |
Amended and Restated 2010 Equity Incentive Plan [Member] | Options |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract] |  |  |  |  |  |  |
Options granted (in shares) | shares |  |  |  | 1,000 |  |  |
Shares issued in Replacement Offering | shares |  |  |  | 1,000 |  |  |

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- Definition Represents the highest amount of shares that an eligible employee can purchase under the plan per period. + References No definition available. + Details
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- Definition Represents the number of offering periods per annum over which an employee may purchase the shares of common stock of the entity under the stock-based compensation arrangements. + References No definition available. + Details
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- Definition Aggregate cash paid by the entity during the period to settle equity instruments granted under equity-based payment arrangements. + 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 (k) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period. + 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 (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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