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Debt - Narrative (Details) - USD ($) | 1 Months Ended | 8 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 31, 2018 | Sep. 30, 2018 | Nov. 30, 2017 | Sep. 30, 2017 | Aug. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  | $ 49,000,000.0 |  |  |  | $ 30,000,000.0
Debt issuance costs |  |  | 200,000 |  |  |  |
Proceeds from borrowings |  | $ 15,000,000 |  |  |  |  |
Adjusted liquidity ratio |  |  |  |  |  | 1.30% |
Repurchase of redeemable convertible preferred stock |  |  |  |  |  |  | 19,000,000
Net proceeds |  | $ 50,000,000 |  |  |  |  |
Upon achieving adjusted net revenue of at least $49.0 million in a trailing three-month period |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  | 40,000,000.0
Revolving Line of Credit |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  | 15,000,000.0
Proceeds from borrowings |  |  | 10,000,000 |  |  |  |
Revolving Line of Credit | Upon achieving adjusted net revenue of at least $49.0 million in a trailing three-month period |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  | 25,000,000.0
First Term Loan |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | $ 15,000,000.0
First Term Loan | Prime Rate |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt, variable rate |  |  |  |  |  | 0.25% |
Second Term Loan |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, face amount |  |  | 9,000,000.0 |  |  |  |
EBITDA, trailing period |  | 6 months |  |  |  |  |
Second Term Loan | Prime Rate |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt, variable rate | 0.25% | 5.25% |  |  | 5.25% |  |
Term Loan |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Proceeds from borrowings |  |  | $ 9,000,000 |  |  |  |
Loan Agreement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Repayment of debt owed | $ 10,000,000 |  |  |  |  |  |
Minimum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
EBITDA, trailing period |  |  |  |  |  | 3 months |
Minimum | Upon achieving adjusted net revenue of at least $49.0 million in a trailing three-month period |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Adjusted net revenue |  |  |  | $ 49,000,000.0 |  |  |
Maximum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
EBITDA, trailing period |  |  |  |  |  | 12 months |

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