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Selected Balance Sheet Data - Changes in Allowance for Doubtful Accounts (Detail) (USD $)
In Thousands, unless otherwise specified |
9 Months Ended | 12 Months Ended | |
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Sep. 30, 2013
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Sep. 30, 2012
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Dec. 31, 2012
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| Accounts, Notes, Loans and Financing Receivable [Line Items] | |||
| Balance at beginning of period | $ (129) | $ (143) | $ (143) |
| Provision for losses on commissions receivable | 8 | 174 | |
| Write-off of uncollectible commissions receivable | 29 | 14 | |
| Balance at end of period | (100) | (129) | |
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Commission receivable [Member]
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| Accounts, Notes, Loans and Financing Receivable [Line Items] | |||
| Provision for losses on commissions receivable | |||
| X | ||||||||||
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- Details
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| X | ||||||||||
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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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| X | ||||||||||
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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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| X | ||||||||||
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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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