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Contingently Issuable Common Stock (Tables)
 12 Months Ended
Dec. 31, 2014
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, 2013
$
60,900

Fair value adjustment of Contingent Payment for year ended December 31, 2014
(7,928
)
Fair Value of OUS Milestone Shares
(38,372
)
December 31, 2014
$
14,600