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Related Party Transactions (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Mar. 31, 2017 | Nov. 30, 2016 | Feb. 28, 2014 | Mar. 31, 2013 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Interest expense |  |  |  |  | $ 1,282 | $ 1,005 | $ 3,826 | $ 2,925
Chief Financial Officer |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Stockholders’ notes receivable |  |  |  | $ 200 |  |  |  |
Stockholders' note interest rate (percent) |  |  |  | 1.09% |  |  |  |
Repayment of stockholders’ notes receivable |  | $ 100 |  |  |  |  |  |
Chief Executive Officer |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Stockholders’ notes receivable |  |  | $ 400 |  |  |  |  |
Stockholders' note interest rate (percent) |  |  | 1.97% |  |  |  |  |
Chief Executive Officer | Forgiveness of Related Party Promissory Note |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Notes receivable forgiven | $ 200 |  |  |  |  |  |  |
Notes receivable percentage of principal approved for forgiveness | 50.00% |  |  |  |  |  |  |
Stock-based compensation expense | $ 400 |  |  |  |  |  |  |
Interest expense | $ 100 |  |  |  |  |  |  |

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