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Description of Business and Summary of Significant Accounting Policies and Practices - Additional Information (Detail) (USD $)
Share data in Thousands, unless otherwise specified
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12 Months Ended |
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Dec. 31, 2014
Distributor
Entity
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Dec. 31, 2013
Distributor
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Dec. 31, 2012
Distributor
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| Description Of Business And Summary Of Significant Accounting Policies And Practices [Line Items] |
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| Property and equipment, estimated useful lives |
3 years |
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| Advertising costs |
$ 780,000.0 |
$ 1,000,000.0 |
$ 1,800,000.0 |
| Reclassification of uncertain tax positions |
$ 534,000 |
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| Number of financial institution |
1 |
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| Percentage of revenue as criteria for major distribution partners |
16.00% |
16.00% |
10.00% |
| Number of distribution partners that were paid consolidated revenue |
1 |
1 |
0 |
| Minimum |
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| Description Of Business And Summary Of Significant Accounting Policies And Practices [Line Items] |
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| Business acquisition, period of amortization of intangible assets |
12 months |
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| Maximum |
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| Description Of Business And Summary Of Significant Accounting Policies And Practices [Line Items] |
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| Business acquisition, period of amortization of intangible assets |
84 months |
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| Leasehold Improvements | Minimum |
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| Description Of Business And Summary Of Significant Accounting Policies And Practices [Line Items] |
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| Property and equipment, estimated useful lives |
3 years |
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| Leasehold Improvements | Maximum |
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| Description Of Business And Summary Of Significant Accounting Policies And Practices [Line Items] |
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| Property and equipment, estimated useful lives |
8 years |
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| Primary Sources of Revenue |
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| Description Of Business And Summary Of Significant Accounting Policies And Practices [Line Items] |
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| Concentration Risk, Percentage |
76.00% |
76.00% |
76.00% |
| Secondary Sources of Revenue |
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| Description Of Business And Summary Of Significant Accounting Policies And Practices [Line Items] |
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| Concentration Risk, Percentage |
24.00% |
24.00% |
24.00% |
| Consolidated Revenue | Customer Concentration Risk |
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| Description Of Business And Summary Of Significant Accounting Policies And Practices [Line Items] |
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| Concentration Risk, Percentage |
10.00% |
10.00% |
10.00% |
| Number of advertising agencies |
0 |
0 |
0 |
| Consolidated Accounts Receivable | Customer Concentration Risk |
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| Description Of Business And Summary Of Significant Accounting Policies And Practices [Line Items] |
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| Concentration Risk, Percentage |
13.00% |
10.00% |
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| Number of advertising agencies |
1 |
0 |
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| Class B | Stock Options |
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| Description Of Business And Summary Of Significant Accounting Policies And Practices [Line Items] |
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| Anti-dilutive shares |
7,797 |
4,565 |
7,029 |
| Unvested Restricted Shares | Class B |
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| Description Of Business And Summary Of Significant Accounting Policies And Practices [Line Items] |
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| Anti-dilutive shares |
1,007 |
174 |
2,433 |
| Restricted Stock Units |
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| Description Of Business And Summary Of Significant Accounting Policies And Practices [Line Items] |
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| Anti-dilutive shares |
1,134 |
43 |
131 |