Quarterly report pursuant to Section 13 or 15(d)

Convertible Note and Long-Term Debt (Details Textual)

v3.20.2
Convertible Note and Long-Term Debt (Details Textual) - USD ($)
$ / shares in Units, shares in Millions
3 Months Ended 9 Months Ended 33 Months Ended
Oct. 14, 2020
Jul. 16, 2020
Apr. 14, 2020
Dec. 09, 2019
Sep. 30, 2020
Sep. 30, 2020
Jul. 01, 2023
Oct. 13, 2020
Dec. 31, 2019
Jun. 05, 2019
Dec. 31, 2018
Debt Instrument [Line Items]                      
Change in fair value for the period           $ 12,200,000          
Conversion of convertible note, amount           $ 149,000,000.0          
Additional warrant issuances           10.00%          
Warrants expiration period         5 years 5 years       7 years  
Warrant exercise price percentage           110.00%          
Warrant liability         $ 0 $ 0     $ 16,335,000    
Warrant                      
Debt Instrument [Line Items]                      
Issuance of common stock (in shares)           8.1          
Convertible Note, at fair value                      
Debt Instrument [Line Items]                      
Face amount       $ 41,000,000.0              
Interest rate       4.50%              
Conversion price (in usd per share)       $ 3.05              
Redemption price, percentage         112.00%            
Periodic payment, principal         $ 1,500,000            
Convertible Note, at fair value         $ 0 $ 0     39,020,000    
Shares issued upon conversion (in shares)         6.1 14.4          
Principal amount outstanding, convertible debt         $ 0 $ 0     $ 40,500,000    
Fair value option, gain (loss) related to change in fair value           74,100,000          
Financial liability, fair value option, unrealized gain (losses) during period           1,100,000          
Conversion of convertible note, amount         18,500,000 40,500,000          
Liquidity requirements, cash and cash equivalents       $ 8,000,000.0              
Warrants to purchase of common stock shares (in shares)       15.5              
Exercise price of warrants (in usd per share)       $ 3.05              
Convertible Note, at fair value | Interest Expense                      
Debt Instrument [Line Items]                      
Fair value option, gain (loss) related to change in fair value           (75,200,000)          
Loss on conversion         14,900,000 35,900,000          
Convertible Note II, at fair value                      
Debt Instrument [Line Items]                      
Face amount   $ 70,000,000.0                  
Interest rate   4.50%                  
Conversion price (in usd per share)   $ 19.00                  
Redemption price, percentage   110.00%                  
Convertible Note, at fair value         121,817,001 121,817,001          
Change in fair value for the period         $ 52,900,000 $ 52,892,001          
Convertible Note II, at fair value | Forecast                      
Debt Instrument [Line Items]                      
Periodic payment, principal             $ 3,900,000        
Convertible Note II, at fair value | Subsequent Event                      
Debt Instrument [Line Items]                      
Face amount $ 70,000,000.0                    
Shares issued upon conversion (in shares) 5.2                    
Convertible Note II, at fair value | Subsequent Event | Workhorse Common Stock                      
Debt Instrument [Line Items]                      
Closing price (in usd per share)               $ 23.63      
Credit Agreement                      
Debt Instrument [Line Items]                      
Exercise price of warrants (in usd per share)                     $ 1.25
Warrants to purchase common stock (in shares)                     8.1
Paycheck Protection Program Term Note                      
Debt Instrument [Line Items]                      
CARES Act, proceeds from loans payable     $ 1,400,000                
CARES Act, interest rate     1.00%