Other Long-Term Liabilities - Deferred (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) item	Dec. 31, 2018 USD ($)
Other Liabilities, Noncurrent [Line Items]
Deferred payment arrangement number of sellers | item	1
Deferred payment arrangements value	$ 2.2	$ 3.1
Funds received from investor	2.8
Asset Retirement Obligation
Other Liabilities, Noncurrent [Line Items]
Deferred rent and other facility costs	$ 2.1	$ 1.9
Minimum
Other Liabilities, Noncurrent [Line Items]
Leasehold improvements and long-term liability amortization period	5 years
Maximum
Other Liabilities, Noncurrent [Line Items]
Leasehold improvements and long-term liability amortization period	10 years