Revenue from Contracts with Customers - Narrative (Details)	6 Months Ended
	Jun. 30, 2020 USD ($) sales_force	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Number Of Sales Forces | sales_force	1
Contract liabilities	$ (6,000,000.0)		$ (5,000,000.0)
Customer deposits	3,289,000		$ 6,389,000
Performance obligation satisfied in previous period	6,800,000
Cash payments received form customers	4,800,000
Contract assets	0
Remaining performance obligation	1,900,000
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	2,000,000.0
UNITED STATES
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	33,800,000	$ 40,400,000
Total Products And Services
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Remaining performance obligation	$ 7,500,000