Debt - Additional Information (Details) - USD ($)		1 Months Ended				8 Months Ended	9 Months Ended	12 Months Ended
	Oct. 01, 2018	Oct. 31, 2018	Sep. 30, 2018	Nov. 30, 2017	Sep. 30, 2017	Aug. 31, 2018	Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity				$ 49,000,000	$ 30,000,000
Debt issuance costs				200,000
Proceeds from borrowings			$ 15,000,000
Adjusted liquidity ratio							1.30%
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
Revolving Line of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity					15,000,000
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
First Term Loan
Debt Instrument [Line Items]
Debt instrument, face amount					15,000,000
First Term Loan | Prime Rate
Debt Instrument [Line Items]
Debt, variable rate							0.25%	0.25%
Second Term Loan
Debt Instrument [Line Items]
Debt instrument, face amount				9,000,000
Second Term Loan | Prime Rate
Debt Instrument [Line Items]
Debt, variable rate			0.25%			5.25%
Term Loan
Debt Instrument [Line Items]
Proceeds from borrowings				$ 9,000,000
Loan Agreement | Subsequent Event
Debt Instrument [Line Items]
Repayment of indebtness owed	$ 15,000,000	$ 25,000,000
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
Maximum
Debt Instrument [Line Items]
EBITDA, trailing period							12 months