Quarterly report pursuant to Section 13 or 15(d)

Document and Entity Information

v3.22.2.2
Document and Entity Information - $ / shares
 6 Months Ended
Sep. 30, 2022
Nov. 14, 2022
Document Information [Line Items]    
Entity Central Index Key 0001009759  
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Sep. 30, 2022  
Document Transition Report false  
Entity File Number 001-15957  
Entity Registrant Name Capstone Green Energy Corporation  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 95-4180883  
Entity Address, Address Line One 16640 Stagg Street  
Entity Address, City or Town Van Nuys  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 91406  
City Area Code 818  
Local Phone Number 734-5300  
Entity Listing, Par Value Per Share $ 0.001  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   18,332,553
Current Fiscal Year End Date --03-31  
Document Fiscal Year Focus 2023  
Document Fiscal Period Focus Q2  
Amendment Flag false  
Common Stock [Member]    
Document Information [Line Items]    
Title of 12(b) Security Common Stock, par value $.001 per share  
Trading Symbol CGRN  
Security Exchange Name NASDAQ  
Series B Junior Participating Preferred Stock    
Document Information [Line Items]    
Title of 12(b) Security Series B Junior Participating Preferred Stock Purchase Rights  
No Trading Symbol Flag true