Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Loss Contingencies [Line Items]
Rent expense	$ 0.4us-gaap_OperatingLeasesRentExpenseNet	$ 0.4us-gaap_OperatingLeasesRentExpenseNet
Minimum
Loss Contingencies [Line Items]
Term of warranties on certain product sales	12 months
Maximum
Loss Contingencies [Line Items]
Term of warranties on certain product sales	24 months

Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717

Name:	us-gaap_OperatingLeasesRentExpenseNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration