Revenue from Contracts with Customers - Narrative (Details)	9 Months Ended
	Sep. 30, 2020 USD ($) sales_force	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Number Of Sales Forces | sales_force	1
Contract liabilities	$ (6,700,000)		$ (5,000,000.0)
Customer deposits	1,477,000		$ 6,389,000
Performance obligation satisfied in previous period	11,000,000.0
Cash payments received form customers	7,800,000
Contract assets	0
Remaining performance obligation	500,000
Calculated under Revenue Guidance in Effect before Topic 606 | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract liabilities	3,200,000
UNITED STATES
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	54,300,000	$ 61,700,000
Total Products And Services
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Remaining performance obligation	$ 7,700,000