CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY - USD ($) $ in Millions	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Total
Balance at beginning of period at Dec. 31, 2018	$ 36.4	$ 4,378.4	$ (4,307.9)	$ 106.9
Balance at beginning of period (in shares) at Dec. 31, 2018	109,435,000
Net Loss			(55.0)	(55.0)
Activity related to stock plans			0.1	0.1
Recapitalization of convertible preferred stock to common stock		1.3		1.3
Recapitalization of convertible preferred stock to common stock (in shares)	364,000
Balance at end of period at Mar. 31, 2019	$ 36.4	4,379.7	(4,362.8)	53.3
Balance at end of period (in shares) at Mar. 31, 2019	109,799,000
Balance at beginning of period at Dec. 31, 2019	$ 36.4	4,382.0	(4,380.7)	$ 37.7
Balance at beginning of period (in shares) at Dec. 31, 2019	107,107,000			107,107,401
Net Loss			(11.7)	$ (11.7)
Repurchase of common stock (in shares)				0
Activity related to stock plans		3.0		$ 3.0
Activity related to stock plans (in shares)	391,000
Balance at end of period at Mar. 31, 2020	$ 36.4	$ 4,385.0	$ (4,392.4)	$ 29.0
Balance at end of period (in shares) at Mar. 31, 2020	107,498,000			107,498,360