Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Amount as of the balance sheet date of the aggregate standard product warranty liability. Does not include the balance for the extended product warranty liability.

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Basis of Financial Presentation and Summary of Significant Accounting Policies - Part Three (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Movement in Standard Product Warranty Accrual [Roll Forward]
Accrued warranty reserve, beginning of period	$ 638,000us-gaap_StandardProductWarrantyAccrual	$ 549,000us-gaap_StandardProductWarrantyAccrual	$ 537,000us-gaap_StandardProductWarrantyAccrual
Estimated warranty expense	1,495,000	578,000	774,000
Amounts charged against warranty reserve	(605,000)	(489,000)	(762,000)
Accrued warranty reserve, end of period	1,528,000us-gaap_StandardProductWarrantyAccrual	638,000us-gaap_StandardProductWarrantyAccrual	549,000us-gaap_StandardProductWarrantyAccrual
Increase in deferred tax asset valuation allowance	(400,000)	3,700,000
Valuation allowance for deferred tax assets	$ 129,862,000	$ 130,232,000
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant (in shares)	275,933
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant (in shares)	1,018,980
Stock options, restricted stock and RSU granted [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant (in shares)	743,047
Amended and Restated 1997 Incentive and Capital Accumulation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	10 years
Shares available for grant (in shares)	275,933
Amended and Restated 1997 Incentive and Capital Accumulation Plan [Member] \| Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant (in shares)	1,018,980
Amended and Restated 1997 Incentive and Capital Accumulation Plan [Member] \| Stock options, restricted stock and RSU granted [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant (in shares)	743,047