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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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Contractual interest rate for funds borrowed, under the debt agreement.

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