Significant Accounting Policies - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) Customer leases	Dec. 31, 2018 USD ($) Customer	Dec. 31, 2017 USD ($) Customer
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Maturity of highly liquid investments	3 months
Warranty period for hardware products (in years)	1 year
Warranty period for software (in days)	90 days
Advertising expense | $	$ 14.6	$ 20.0	$ 19.9
More than likely percentage of being realized upon settlement, tax benefit	50.00%
Liability for unrecognized tax benefits as current, period	1 year
Number of customers accounting for more than 10% of revenues | Customer	0	0	0
Number of finance leases | leases	0
Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Intangible assets, estimated useful life	4 years
Revenue from contract with customers, terms of payment (in days)	30 days
Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Intangible assets, estimated useful life	5 years
Revenue from contract with customers, terms of payment (in days)	90 days
Interest Rate Swap
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Expiration period	10 years