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v3.10.0.1

Debt (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) note | Dec. 31, 2016 USD ($) | Sep. 30, 2018 USD ($)
Line of Credit Facility [Line Items] |  |  |
Total outstanding | $ 4,721,000 |  | $ 432,000
2017 Insurance Note Payable | Insurance Notes Payable |  |  |
Line of Credit Facility [Line Items] |  |  |
Number of notes financed | note | 3 |  |
Face amount | $ 5,100,000.0 |  |
Interest rate | 2.90% |  |
Total outstanding | $ 4,700,000 |  | 400,000
Revolving Credit Facility | Line of Credit | Revolving Credit Facility Maturing August 2018 |  |  |
Line of Credit Facility [Line Items] |  |  |
Letters of credit, amount outstanding | 2,800,000 |  | 2,800,000
Maximum borrowing capacity limit |  |  | 100,000,000.0
Letter of Credit | Line of Credit | Revolving Credit Facility Maturing August 2018 |  |  |
Line of Credit Facility [Line Items] |  |  |
Maximum borrowing capacity limit |  |  | 20,000,000.0
Swing Line Loan | Line of Credit | Revolving Credit Facility Maturing August 2018 |  |  |
Line of Credit Facility [Line Items] |  |  |
Maximum borrowing capacity limit |  |  | 10,000,000.0
Citibank Credit Facility | Line of Credit |  |  |
Line of Credit Facility [Line Items] |  |  |
Letters of credit, amount outstanding | $ 2,600,000 |  | $ 2,300,000
Maximum borrowing capacity limit |  | $ 6,000,000.0 |
Expiration period |  | 3 years |
Fixed interest rate, short-term |  | 1.25% |
Fixed interest rate, long-term |  | 1.50% |

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