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Debt - Summary of Carrying Value of Debt (Details) | 1 Months Ended | 8 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Oct. 31, 2018 | Sep. 30, 2018 USD ($) installment | Aug. 31, 2018 | Dec. 31, 2018 USD ($) installment | Dec. 31, 2017 USD ($)
Debt Instrument [Line Items] |  |  |  |  |
Total debt |  |  |  | $ 24,000,000 | $ 34,000,000
Less: Unamortized debt discount issuance costs |  |  |  | (90,000) | (167,000)
Balance |  |  |  | 23,910,000 | 33,833,000
Debt, current |  |  |  | (5,671,000) | (10,342,000)
Debt, noncurrent |  |  |  | $ 18,239,000 | $ 23,491,000
Weighted-average interest rate |  |  |  | 6.89% | 5.93%
First term loan—18 months of interest-only payments ending in March 2019 followed by 36 equal monthly installments of principal plus interest, maturing March 2022; interest at Prime plus 0.25% per annum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total debt |  |  |  | $ 15,000,000 | $ 15,000,000
Interest only payments term |  |  |  | 18 months |
Number of equal monthly installments of principal and interest | installment |  |  |  | 36 |
First term loan—18 months of interest-only payments ending in March 2019 followed by 36 equal monthly installments of principal plus interest, maturing March 2022; interest at Prime plus 0.25% per annum | Prime Rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt, variable rate |  |  |  | 0.25% |
Second term loan—11 months of interest-only payments ending in October 2018 followed by 47 equal monthly installments of principal plus interest, maturing September 2022. As of September 30, 2018, the Company achieved trailing six-month EBITDA of at least $1.0 million; as a result, the interest-only repayment period extended to March 2019, followed by 42 equal monthly installments of principal plus interest; bears interest at Prime plus 5.25% per annum. As a result of the Company's IPO, the interest rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total debt |  |  |  | $ 9,000,000 | 9,000,000
Interest only payments term |  |  |  | 11 months |
Number of equal monthly installments of principal and interest | installment |  | 42 |  | 47 |
EBITDA, trailing period |  | 6 months |  |  |
EBITDA |  | $ 1,000,000.0 |  |  |
Second term loan—11 months of interest-only payments ending in October 2018 followed by 47 equal monthly installments of principal plus interest, maturing September 2022. As of September 30, 2018, the Company achieved trailing six-month EBITDA of at least $1.0 million; as a result, the interest-only repayment period extended to March 2019, followed by 42 equal monthly installments of principal plus interest; bears interest at Prime plus 5.25% per annum. As a result of the Company's IPO, the interest rate | Prime Rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt, variable rate | 0.25% | 5.25% | 5.25% |  |
Line of credit—interest at Prime with accrued interest due monthly; matures September 2020 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total debt |  |  |  | $ 0 | $ 10,000,000

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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