Fair Value of Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2018

Fair Value Disclosures [Abstract]

Fair Value of Financial Instruments

The following tables set forth the fair value of the Company’s financial instruments (in millions):

	As of March 31, 2018
	Carrying Amount		Significant Unobservable Inputs         (Level 3)		Fair Value
Financial liabilities:
Senior convertible notes (2021 notes)	$	24.4	$	19.9	$	19.9
Facility financing obligation		43.7		50.1		50.1
Note payable to related party		72.2		68.8		68.8
Milestone rights		8.9		17.8		17.8
Total financial liabilities	$	149.2	$	156.6	$	156.6

	As of December 31, 2017
	Carrying Value		Significant Unobservable Inputs         (Level 3)		Fair Value
Financial liabilities:
Senior convertible notes (2021 notes)	$	24.4	$	19.8	$	19.8
Facility financing obligation		52.7		54.6		54.6
Milestone rights		8.9		19.1		19.1
Total financial liabilities	$	86.0	$	93.5	$	93.5