Selected Balance Sheet Data - Schedule of Other Assets (Parenthetical) (Detail) - USD ($) |
3 Months Ended | 9 Months Ended | |||
|---|---|---|---|---|---|
Sep. 30, 2015 |
Sep. 30, 2014 |
Sep. 30, 2015 |
Sep. 30, 2014 |
Dec. 31, 2014 |
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| Other Assets [Line Items] | |||||
| Allowance of doubtful accounts | $ 261,000 | $ 261,000 | $ 193,000 | ||
| Provision for bad debt expense | 48,000 | $ 44,000 | 127,000 | $ 86,000 | |
| Write-off receivables | $ 24,000 | $ 23,000 | $ 59,000 | $ 110,000 | |
| 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 Notes Receivable Due Period No definition available.
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- Definition Other Assets [Line Items] No definition available.
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- Definition For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of direct write-downs of accounts receivable charged against the allowance. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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