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Prepaid and Other Assets	12 Months Ended
Prepaid and Other Assets	Dec. 31, 2017
Prepaid and Other Assets [Abstract]
Prepaid and Other Assets	5. Prepaid and Other Assets At December 31, 2017 and 2016, the Company had $1.9 million and $3.4 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.