Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Other Commitments (Details)

v3.6.0.2
Commitments and Contingencies - Other Commitments (Details)
$ in Millions
1 Months Ended
Jul. 18, 2016
complaint
Sep. 30, 2015
USD ($)
Sep. 30, 2010
Dec. 31, 2016
USD ($)
complaint
Commitments and Contingencies        
Inventory at distributors       $ 0.0
Legal matters        
Number of putative securities class action complaints filed against the Company | complaint       2
Number of additional purported shareholder derivative actions filed | complaint 2      
Research, development and testing of a more efficient microturbine Combined Heat and Power (CHP) system        
Commitments and Contingencies        
Projected cost of research, development and testing project   $ 11.7    
Contribution by DOE   4.2    
Expense to be incurred by the company in research and development   6.7    
Cumulative amount of bill under contract   4.2    
Research, development and testing of a more efficient microturbine Combined Heat and Power (CHP) system | DOE        
Commitments and Contingencies        
Term of contract     5 years  
Contribution by DOE   $ 5.0