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Prepaid and Other Assets
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12 Months Ended |
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Dec. 31, 2014
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| Prepaid and Other Assets [Abstract] | |
| Prepaid and Other Assets | 5. Prepaid and Other Assets At December 31, 2014 and 2013, the Company had $3.3 million and $2.3 million, respectively, of prepaid and other current assets, which consist primarily of deposits on contracts for research and development, prepaid insurance and leases for its facility |