Net Loss Per Common Share (Tables)

3 Months Ended

Mar. 31, 2016

Earnings Per Share [Abstract]

Historical Outstanding Anti-Dilutive Securities

Historical outstanding anti-dilutive securities not included in diluted net loss per share attributable to common stockholders calculation (in millions):

	Three Months Ended   March 31,
	2016	2015
Options outstanding to purchase common stock	1.2	2.7
Unvested restricted stock units	3.9	4.4
Total	5.1	7.1