Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2016

Fair Value Disclosures [Abstract]

Financial Instruments Measured at Fair Value Measured on Recurring Basis

The following table presents financial instruments measured at fair value measured on a recurring basis:

	December 31, 2016
	Carrying value		Level 1		Level 2		Level 3
Cash and cash equivalents - money market fund	$	12.1	$	12.1	$	—	$	—
Warrant liability		0.8		—		—		0.8

	December 31, 2015
	Carrying value		Level 1		Level 2		Level 3
Cash and cash equivalents - money market fund	$	13.7	$	13.7	$	—	$	—
Warrant liability		—		—		—		—

Summary of Activities in Company's Level 3 Warrants

The following table represents the activity in the Company’s Level 3 warrants during the years ended:

(In millions)	Amount
Level 3 warrants, ending balance at December 31, 2013	$	0.8
Change in fair value of warrant liability		0.1
Warrant exercise		(0.5	)
Level 3 warrants, ending balance at December 31, 2014		0.4
Change in fair value of warrant liability		—
Warrant exercise		(0.4	)
Level 3 warrants, ending balance at December 31, 2015		—
Addition - Hercules warrants, initial fair value		0.9
Change in fair value of warrant liability		(0.1	)
Level 3 warrants, ending balance at December 31, 2016	$	0.8