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Stockholders' Equity (Deficit) - Shares Authorized and Outstanding (Details) - shares
shares in Thousands
Mar. 31, 2019
Dec. 30, 2018
Stockholders' Equity / (Deficit)    
Authorized shares of preferred stock 5,000  
Authorized shares of common stock 100,000  
Outstanding shares of common stock , net of repurchased stock 31,400 31,400
Series B Convertible Preferred Stock, shares outstanding 252,530