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Commitments and Contingencies (Details) - USD ($)
$ in Millions
3 Months Ended
Oct. 01, 2016
May 01, 2015
Mar. 31, 2018
Mar. 31, 2017
Other Commitments [Line Items]        
Operating leases, contract term 4 years 5 years    
Expected annual sublease income $ 0.4      
Sublease income     $ 0.1 $ 0.1
General and Administrative Expense        
Other Commitments [Line Items]        
Lease expenses     $ 0.5 $ 0.5