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Selected Balance Sheet Data - Schedule of Other Assets (Parenthetical) (Detail) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Other Assets [Line Items] |  |  |
Allowance of doubtful accounts | $ 208,000 us-gaap_AllowanceForDoubtfulAccountsReceivable |  | $ 193,000 us-gaap_AllowanceForDoubtfulAccountsReceivable
Provision for bad debt expense | 21,000 us-gaap_ProvisionForDoubtfulAccounts | 11,000 us-gaap_ProvisionForDoubtfulAccounts |
Write-off receivables | $ 6,000 us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs | $ 41,000 us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs |
Minimum [Member] |  |  |
Other Assets [Line Items] |  |  |
Notes receivable due period | 1 year |  |
Maximum [Member] |  |  |
Other Assets [Line Items] |  |  |
Notes receivable due period | 5 years |  |

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- Definition For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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