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Commitments and Contingencies - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Commitments And Contingencies Disclosure [Line Items] |  |  |
Rent expense under company's operating leases | $ 5,992 | $ 5,996 | $ 3,243
Rights and ownership purchase of intellectual property |  |  | 37
Expected future payments | 1,312 |  |
Patents |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |
Rights and ownership purchase of intellectual property | 7,000 |  |
Number of Quarterly Installment Payments | 9 |  |
Johnson Controls |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |
Installment payments | $ 1,688 |  |

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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References 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 + Details
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- Definition The cash outflow to acquire asset without physical form usually arising from contractual or other legal rights, excluding goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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