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Stock-Based Compensation - Narrative (Details) |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
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Aug. 23, 2016 shares | Jan. 01, 2016 shares | May 31, 2015 shares | Jun. 30, 2014 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 ($) shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 USD ($) shares | Dec. 31, 2014 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Options granted (in shares) |  |  |  |  |  | 0 |  |  |  |  |  |  |
Shares issued in Replacement Offering | 334,027 |  |  |  |  |  |  |  |  |  |  |  |
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 |  | $ 2,600,000 |  |
Weighted average expected period over which the expense is to be recognized |  |  |  |  |  |  |  |  | 1 year 10 months 24 days |  | 2 years 7 months 6 days |  |
Tax benefits associated with exercise of stock options | $ |  |  |  |  |  | 0 |  | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0
Stock options exercised |  |  |  |  |  |  |  |  | 0 | 0 |  |  |
RSU's |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized compensation cost, net of expected forfeitures | $ |  |  |  |  |  |  |  |  |  |  | $ 600,000 |  |
Weighted average expected period over which the expense is to be recognized |  |  |  |  |  |  |  |  | 1 year 4 months 24 days |  | 2 years |  |
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 |  |  | 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 |  | 50,000 |  |  |  |  | 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) |  |  |  |  |  |  | 1,000 |  |  |  |  |  |
Shares issued in Replacement Offering |  |  |  |  |  |  | 1,000 |  |  |  |  |  |
Increase in number of shares reserved for issuance |  |  |  | 150,000 |  |  |  |  |  |  | 50,000 | 50,000 | 200,000

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