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Stockholders' Deficit	6 Months Ended
Stockholders' Deficit	Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stockholders' Deficit	STOCKHOLDERS’ DEFICIT Change in Stockholders’ Deficit Total stockholders’ deficit was $41.2 million at June 30, 2018, which is an increase of $27.1 million as compared to stockholders’ deficit at December 31, 2017 of $14.1 million. This increase was primarily attributable to our net loss of approximately $43.4 million for the six months ended June 30, 2018, partially offset by $8.7 million related to stock-based compensation expense, $6.2 million related to the recognition of an additional debt discount recorded in connection with the modification of our senior convertible notes and $0.6 million related to an adjustment to accumulated deficit as of January 1, 2018 upon the adoption of ASU 2014-09. See Note 8 - License Agreements for further discussion related to the adjustment recorded.