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Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2013
Subsequent Events [Abstract]
Subsequent Events	20. Subsequent Events In February 2014, the Company received notice of an award of $0.6 million of tax incentives from the MLSC, which will allow the Company to monetize approximately $0.6 million of state research and development tax credits. In exchange for these incentives, the Company pledged to hire an incremental 31 employees and to maintain the additional headcount through at least December 31, 2018. Failure to do so could result in the Company being required to repay some or all of these incentives. In February 2014, Hercules exercised warrants to purchase 302,143 shares of common stock for proceeds of $1.1 million.