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Property and Equipment - Credit Facility with SVB (Details) (USD $)
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12 Months Ended | |||
|---|---|---|---|---|
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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May 31, 2013
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| Line of Credit Facility [Line Items] | ||||
| Line of Credit Facility, Maximum Borrowing Capacity | $ 26,500,000 | |||
| Impairment of long-lived assets | $ 0 | $ 949,000 | $ 0 | |