Related Party Transactions - Additional Information (Detail) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Related Party Transaction [Line Items]
Proceeds from sale of investment	$ 81,000
Gain on sale of investment	59,000
RFL Communications PLC [Member]
Related Party Transaction [Line Items]
Carrying value of investment sold	22,000
Outstanding equity percentage sold	5.00%
Sales revenue	927,000	626,000	655,000
Accounts receivable due	$ 285,000	$ 35,000

For an unclassified balance sheet, amount of receivables arising from transactions with related parties.

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+ Details

- Definition

The cash inflow associated with the sale or maturity (principal being due) of securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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+ Details

- Definition

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

+ References+ Details