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Stock Based Compensation - Narrative (Details) | Sep. 30, 2017 USD ($) shares | Dec. 31, 2016 shares | May 28, 2014 event shares
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Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |
Outstanding number of shares underlying options (in shares) | 1,206,000 | 1,222,000 |
Unrecognized stock-based compensation expense | $ | $ 0 |  |
Equity Incentive Plan, 2014 | Stock Options |  |  |
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |
Shares available for issuance (in shares) | 733,000 |  | 4,400,000
Equity Incentive Plan, 2014 | Minimum |  |  |
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |
Number of events to occur to permit granting (or more) | event |  |  | 1
Stock Incentive Plan, 2000 | Stock Options |  |  |
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |
Shares available for issuance (in shares) | 0 |  |
Outstanding number of shares underlying options (in shares) | 3,000 |  |
Stock Incentive Plan, 2007 | Stock Options |  |  |
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |
Shares available for issuance (in shares) | 0 |  |
Outstanding number of shares underlying options (in shares) | 1,203,000 |  |
Stock Incentive Plan, 2007 | Unvested restricted stock |  |  |
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |
Outstanding number of shares underlying restricted stock awards (in shares) | 184,000 |  |

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