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Balance Sheet Information (Details 3) (USD $)
 0 Months Ended 1 Months Ended 3 Months Ended 12 Months Ended
Sep. 28, 2010
May 05, 2014
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Cost Method Investment              
Cost method investments $ 3,000,000 $ 600,000 $ 200,000   $ 2,400,000 $ 10,300,000 $ 1,200,000
Term of bridge note     1 year        
Interest rate on bridge notes (as a percent)         4.00%    
Percentage ownership of preferred shares     15.40%   15.40%    
Percentage ownership of cost method investee     11.00%   11.00%    
Customer Deposits and Deferred Revenue              
Customer deposits     31,300,000   27,500,000    
Accrued Warranty              
Balance as of the beginning of period   5,110,000 5,662,000 4,942,000 4,942,000    
Warranties issued during the period     643,000 478,000      
Settlements made during the period     (1,195,000) (1,341,000)      
Balance as of the end of period     5,110,000 4,079,000 5,662,000 4,942,000  
Tools
              
Property, plant and equipment, net              
Assets held for sale     5,800,000        
Assets converted and sold     1,400,000        
Aggregate selling price     $ 2,300,000