Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Schedule of Changes in Aggregate Product Warranty Liabilities (Details)

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Commitments and Contingencies - Schedule of Changes in Aggregate Product Warranty Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Commitments And Contingencies Disclosure [Abstract]    
Product warranty liability at beginning of period $ 1,115us-gaap_ProductWarrantyAccrual $ 809us-gaap_ProductWarrantyAccrual
Accruals for warranties issued 391us-gaap_ProductWarrantyAccrualWarrantiesIssued 1,075us-gaap_ProductWarrantyAccrualWarrantiesIssued
Adjustments related to preexisting warranties (including changes in estimates) 150us-gaap_ProductWarrantyAccrualPreexistingIncreaseDecrease 406us-gaap_ProductWarrantyAccrualPreexistingIncreaseDecrease
Settlements made (in cash or in kind) (265)us-gaap_ProductWarrantyAccrualPayments (1,175)us-gaap_ProductWarrantyAccrualPayments
Product warranty liability at end of period $ 1,391us-gaap_ProductWarrantyAccrual $ 1,115us-gaap_ProductWarrantyAccrual