Contingently Issuable Common Stock (Tables)

12 Months Ended

Dec. 31, 2013

Business Combinations [Abstract]

Schedule of Business Acquisitions by Acquisition, Fair Value of Contingent Consideration

Adjustments to the fair value of the Contingent Payment are recognized within "other income (expense)" in the Consolidated Statements of Operations and Comprehensive Loss.

	Fair Value of Contingently Issuable Common Stock
December 31, 2012	$	52,400
Fair value adjustment of Contingent Payment for year ended December 31, 2013	8,500
December 31, 2013	$	60,900

As of December 31, 2013, $46.5 million was presented in current liabilities due to the expected achievement of one of the Nellix Milestones in the second half of 2014.