Summary of Significant Accounting Policies - Warranties (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Product Warranty Liability [Line Items]
Warranty accrual	$ 2.6	$ 2.9
Minimum
Product Warranty Liability [Line Items]
Product warranty period against materials and manufacturing defects	1 year
Maximum
Product Warranty Liability [Line Items]
Product warranty period against materials and manufacturing defects	5 years