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Taxation - Summary of Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | --- | --- | ---
Deferred tax assets: |  |  |  |
Stock compensation expense | $ 4,922 | $ 7,936 |  |
Alternative minimum tax credit | 0 | 71 |  |
Warranty reserve | 232 | 291 |  |
Bad debts reserve | 131 | 65 |  |
Vacation accrual | 188 | 157 |  |
Commissions and other accruals | 223 | 205 |  |
Deferred rent liability | 36 | 53 |  |
Equipment | 92 | 69 |  |
Intangible assets | 921 | 778 |  |
Net operating loss carryforwards | 1,833 | 1,868 |  |
Total deferred tax assets | 8,578 | 11,493 |  |
Deferred tax liabilities: |  |  |  |
Equipment | (1,610) | (1,466) |  |
Prepaid expenses | (285) | (200) |  |
Patents | (628) | (489) |  |
Goodwill | (3,792) | (3,193) |  |
Other | (12) | (16) |  |
Total deferred tax liabilities | (6,327) | (5,364) |  |
Net deferred tax asset before valuation allowance | 2,251 | 6,129 |  |
Valuation allowances for deferred tax assets | (1,833) | (1,868) | (1,327) | (1,102)
Net deferred tax asset | $ 418 | $ 4,261 |  |

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- Definition Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6969291&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 43 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 11 -Subparagraph d, e, f -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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