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Debt - Term Loan (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2018 | Nov. 30, 2015 | Sep. 30, 2018 | Sep. 30, 2018 | Dec. 31, 2018
Debt Instrument [Line Items] |  |  |  |  |
Loss on debt extinguishment |  |  |  | $ 88 |
Accretion of the debt discount |  |  |  | 75 |
Secured Debt | Term Loan |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal amount |  | $ 8,000 |  |  |
Interest rate (as a percent) |  | 7.50% |  |  |
Principal balance repurchased | $ 2,900 |  |  |  |
Final balloon payment | $ 640 |  |  |  |
Early payment penalty fee (as a percent) | 1.00% |  |  |  |
Early payment penalty fee amount | $ 15 |  |  |  |
Unamortized debt discount | $ 88 |  |  |  |
Loss on debt extinguishment |  |  |  |  | $ 88
Interest expense |  |  | $ 0 | 129 |
Accretion of the debt discount |  |  | $ 0 | $ 75 |
Final payment fee (as a percent) |  | 8.00% |  |  |
Secured Debt | Term Loan | Repaid on or before first anniversary |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Early payment penalty fee (as a percent) |  | 3.00% |  |  |
Secured Debt | Term Loan | Repaid on or before second anniversary |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Early payment penalty fee (as a percent) |  | 2.00% |  |  |
Secured Debt | Term Loan | Repaid after second anniversary before maturity date |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Early payment penalty fee (as a percent) |  | 1.00% |  |  |
Secured Debt | Term Loan | London Interbank Offered Rate (LIBOR) |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Variable rate spread (as a percent) |  | 7.30% |  |  |

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- Definition Amount recognized for the passage of time, typically for liabilities, that have been discounted to their net present values. Excludes accretion associated with asset retirement obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392676&loc=d3e7480-110848 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 35 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6394232&loc=d3e17558-110866 + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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