Commitments and Contingencies (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Movement in Standard Product Warranty Accrual [Roll Forward]
Warranty liability balance, beginning of the period	$ 2,600,000	$ 3,328,000
Product warranty accruals	623,000	433,000
Utilization of accrual	(517,000)	(683,000)
Warranty liability balance, end of the period	2,706,000	3,078,000
Product Warranty Accrual, Current	2,100,000		2,000,000
Product Warranty Accrual, Noncurrent	$ 600,000		$ 600,000
Minimum [Member]
Product Warranty Liability [Line Items]
Warranty, Term	12 months
Maximum [Member]
Product Warranty Liability [Line Items]
Warranty, Term	24 months