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Other Long-Term Liabilities - Deferred (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) item	Dec. 31, 2017 USD ($)
Deferred payment arrangement number of sellers \| item	1
Deferred payment arrangements value	$ 3.1	$ 3.6
Funds received from investor	$ 2.8
Minimum
Leasehold improvements and long-term liability amortization period	5 years
Maximum
Leasehold improvements and long-term liability amortization period	10 years