Fair Value of Financial Instruments (Tables)

12 Months Ended

Dec. 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 as of December 31, 2018 and 2017 (in millions):

	As of December 31, 2018
			Fair Value
	Carrying Amount		Significant Unobservable Inputs (Level 3)		Total Fair Value
Financial liabilities:
Senior convertible notes (2021 notes)	$	19.1	$	17.5	$	17.5
Facility Financing Obligation		11.3		11.4		11.4
Note payable to related party		72.1		55.0		55.0
Milestone rights		8.9		18.1		18.1
Total financial liabilities	$	111.4	$	102.0	$	102.0

	As of December 31, 2017
			Fair Value
	Carrying Value		Significant Unobservable Inputs (Level 3)		Total 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