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Net Loss Per Common Share (Tables)
3 Months Ended
Mar. 31, 2018
Earnings Per Share [Abstract]  
Historical Outstanding Anti-Dilutive Securities
Outstanding anti-dilutive securities not included in diluted net loss per share attributable to common stockholders calculation (in millions):
 
Three Months Ended 
 March 31,
 
2018
 
2017
Options outstanding to purchase common stock
0.4

 
0.5

Unvested restricted stock units
3.1

 
3.1

Senior convertible notes
4.0

 

Total
7.5

 
3.6