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Acquisition (Details Textual) (USD $) | 0 Months Ended | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  | 1 Months Ended |  | 9 Months Ended | 1 Months Ended |  | 1 Months Ended
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Oct. 31, 2012 | Apr. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2012 | Jul. 31, 2012 | Apr. 07, 2011 | Apr. 30, 2012 Jingle Networks, Inc [Member] | Sep. 30, 2012 Jingle Networks, Inc [Member] | Sep. 30, 2012 Maximum [Member] | Sep. 30, 2012 Minimum [Member] | Sep. 30, 2012 Restricted stock [Member] | Apr. 30, 2012 Restricted stock [Member] Jingle Networks, Inc [Member] | Apr. 07, 2011 Restricted stock [Member] Jingle Networks, Inc [Member] | Apr. 30, 2011 Class B [Member]
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, restricted shares issued |  |  |  |  |  |  |  |  |  |  |  | 923,250 | 462,247 |  |
Business acquisition, shares issued at acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,019,103
Business acquisition share based compensation, vesting period |  |  |  |  |  |  |  | 4 years |  |  |  |  |  |  |
Fair value of shares issued |  |  |  |  | $ 7,600,000 |  | $ 7,603,000 |  |  |  |  |  |  |  |
Business acquisition, share price |  |  |  |  | $ 7.46 |  |  |  |  |  |  |  |  |  |
Business acquisition, period of amortization of intangible assets |  |  |  |  |  |  |  |  |  | 36 months | 12 months |  |  |  |
Business acquisition share based compensation, amount paid |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,300,000 |
Cash, net of cash acquired |  |  |  |  |  |  | 15,800,000 |  |  |  |  |  |  |  |
Acquisition (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of stock acquired |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |
Future consideration, net of working capital adjustments |  |  |  |  |  |  | 17,600,000 |  |  |  |  |  |  |  |
Future consideration payable, cash or share |  |  |  |  |  |  | 18,000,000 |  |  |  |  |  |  |  |
Increase in deferred consideration for share payment |  |  |  |  |  |  | 5.00% |  |  |  |  |  |  |  |
Cash paid, net of working capital and other adjustments |  | 16,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Cash paid, net of working capital and other adjustments, for 18 Months | 17,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of future consideration |  |  |  |  | 34,700,000 |  |  |  |  |  |  |  |  |  |
Business acquisition, discounted rate of company's incremental borrowing |  |  |  |  | 2.00% |  |  |  |  |  |  |  |  |  |
Business acquisition future obligation of non-cancelable lease and other costs |  |  |  | 372,000 |  |  |  |  |  |  |  |  |  |  |
Acquisition related costs |  |  | 132,000 |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, estimation of net operating loss carryforwards |  |  |  |  |  | 7,000,000 |  |  |  |  |  |  |  |  |
Business acquisition, adjustment to goodwill |  |  |  | 2,400,000 |  |  |  |  |  |  |  |  |  |  |
Intangible assets from acquisitions, Net |  |  |  |  |  | $ 12,000,000 |  |  | $ 11,966,000 |  |  |  |  |  |
Weighted average life of intangible assets |  |  |  |  | 2 years 4 months 24 days |  |  |  |  |  |  |  |  |  |

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