XML 51 R40.htm IDEA: XBRL DOCUMENT v3.10.0.1
Stockholders' Equity - Summary of Changes in Stockholders' Equity (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jul. 01, 2018
Jun. 25, 2017
Jul. 01, 2018
Jun. 25, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Stockholders’ equity at beginning of period     $ 511.5 $ 276.4
Comprehensive loss:        
Net loss $ (7.7) $ (6.2) (9.9) (16.2)
Change in cumulative translation adjustment 0.1 0.0 0.0 0.1
Comprehensive loss (7.6) (6.2) (9.9) (16.1)
Exercise of stock options and warrants     0.0 0.4
Stock-based compensation     3.4 4.0
Issuance of common stock for cash     0.0 81.9
Issuance of common stock for employee stock purchase plan     1.8 1.4
Restricted stock units traded for taxes     (0.1) (1.0)
Stockholders’ equity at end of period 506.5 347.0 506.5 347.0
ASC 606        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Impact from the adoption of ASC 606 $ (0.2) $ 0.0 $ (0.2) $ 0.0