Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Details 2)

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Stock-Based Compensation (Details 2) - shares
 3 Months Ended
Jun. 30, 2015
Mar. 31, 2015
Non-qualified stock options issued prior to Fiscal 2013    
Stockholders' equity    
Options granted (in shares) 3,300,000  
Stock options    
Stockholders' equity    
Options outstanding (in shares) 12,001,194 13,163,363
Options granted (in shares) 584,500  
Forfeited, cancelled or expired (in shares) (1,746,669)  
Restricted stock units    
Stockholders' equity    
Granted (in shares) 457,240  
Restricted stock units outstanding (in shares) 1,801,255 1,868,574
Capstone Turbine Corporation 2000 Equity Incentive Plan    
Stockholders' equity    
Number of shares of common stock reserved for issuance 27,980,000  
Vesting period 4 years  
Expiration Term 10 years  
Capstone Turbine Corporation 2000 Equity Incentive Plan | Stock options    
Stockholders' equity    
Portion vesting one year after the issuance date (as a percent) 25.00%  
Portion vesting on first day of each month after one year from the issuance date (as a percent) 2.083%  
Vesting period after one year of grant 48 months  
Non-qualified stock options | Non-qualified stock options issued prior to Fiscal 2013    
Stockholders' equity    
Options granted (in shares) 46,875  
Non-qualified stock options | Stock options    
Stockholders' equity    
Options outstanding (in shares) 3,550,000  
Options granted (in shares) 3,550,000  
Granted (in shares) 250,000  
Non-qualified stock options | Stock options | Vice President and chief executive officer    
Stockholders' equity    
Options granted (in shares) 2,000,000  
Non-qualified stock options | Stock options | Executive vice president of sales and marketing    
Stockholders' equity    
Options granted (in shares) 850,000  
Non-qualified stock options | Stock options | Senior vice president of program management    
Stockholders' equity    
Options granted (in shares) 250,000  
Non-qualified stock options | Stock options | Vice President of Operations    
Stockholders' equity    
Options granted (in shares) 250,000  
Non-qualified stock options | Stock options | Former Senior vice president of human resources    
Stockholders' equity    
Options granted (in shares) 200,000  
Non-qualified stock options | Restricted stock units    
Stockholders' equity    
Options granted (in shares) 46,875  
Non-qualified stock options | Restricted stock units | Vice President of Operations    
Stockholders' equity    
Options granted (in shares) 46,875