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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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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.

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Amount, after accumulated amortization, of debt discount.

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