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Property and Equipment - Net - Additional Disclosures (Details) (USD $)
In Thousands, unless otherwise specified |
Sep. 30, 2013
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Dec. 31, 2012
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| Property and Equipment - Net (Textual) [Abstract] | ||||||||||
| Property and equipment-gross | $ 28,996 | $ 23,526 | ||||||||
| Accumulated depreciation of equipment under capital leases | 15,752 | [1] | 12,483 | [1] | ||||||
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Capital lease obligations [Member]
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| Property and Equipment - Net (Textual) [Abstract] | ||||||||||
| Accumulated depreciation of equipment under capital leases | 1,798 | 1,834 | ||||||||
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Computer equipment [Member]
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| Property and Equipment - Net (Textual) [Abstract] | ||||||||||
| Property and equipment-gross | 18,829 | [2] | 17,630 | [2] | ||||||
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Computer equipment [Member] | Capital lease obligations [Member]
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| Property and Equipment - Net (Textual) [Abstract] | ||||||||||
| Property and equipment-gross | 4,988 | 5,882 | ||||||||
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Work in process [Member]
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| Property and Equipment - Net (Textual) [Abstract] | ||||||||||
| Property and equipment-gross | 2,931 | [3] | 226 | [3] | ||||||
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Software Development [Member]
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| Property and Equipment - Net (Textual) [Abstract] | ||||||||||
| Property and equipment-gross | $ 2,800 | $ 40 | ||||||||
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