Revenue from Contracts with Customers - Narrative (Details) - USD ($)		9 Months Ended
		Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Mar. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cumulative impact of new standard	[1]			$ 1,000	$ 755,000
Customer deposits		$ 6,462,000	$ 8,167,000
Contract liabilities		(5,300,000)	$ (11,500,000)
Performance obligation satisfied in previous period		23,900,000
Cash payments received form customers		16,000,000
Contract assets		0
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		$ 8,000,000
Accumulated Deficit
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cumulative impact of new standard	[1]			$ 1,000	$ 755,000

[1] Effective January 1, 2018, we adopted Accounting Standard Update No. 2014-09, Revenue from Contracts with Customers. See Note 2. Significant Accounting Policies and Note 3. Revenue from Contracts with Customers for more information.