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Commitments and Contingencies - Narrative (Details) - USD ($) $ in Thousands | 1 Months Ended | 2 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2015 | Jun. 30, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |  |
Net rent expense |  |  | $ 1,200 | $ 1,208 | $ 783
Total settlement amount |  | $ 330 |  |  |
Insurance reimbursement | $ 174 |  |  |  |
Selling, general, and administrative | Settled litigation |  |  |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |  |
Insurance reimbursement |  |  |  |  | 174
Litigation expense |  |  |  |  | $ (156)

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