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Loans Payable - Note 4 - Epsilon - Additional Information (Detail)
$ / shares in Units, Cuota in Millions
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 30, 2021
shares
Aug. 10, 2017
USD ($)
Mar. 21, 2017
USD ($)
shares
Dec. 15, 2016
$ / shares
shares
Nov. 15, 2016
$ / shares
shares
Oct. 16, 2016
$ / shares
shares
Oct. 01, 2016
USD ($)
d
$ / shares
shares
Mar. 18, 2016
USD ($)
Cuota
d
$ / shares
Nov. 30, 2020
shares
Jun. 30, 2021
USD ($)
$ / shares
shares
Jun. 30, 2020
USD ($)
Jun. 30, 2017
USD ($)
shares
Jun. 30, 2021
USD ($)
Cuota
d
$ / shares
shares
Jun. 30, 2020
USD ($)
Dec. 31, 2017
USD ($)
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
shares
Aug. 21, 2020
$ / shares
shares
Sep. 30, 2019
USD ($)
Jan. 25, 2017
USD ($)
Mar. 17, 2016
$ / shares
Debt Instrument [Line Items]                                          
Aggregate amount issuable             $ 3,000,000.0                            
Conversion price of Notes | $ / shares                   $ 4.67     $ 4.67                
Number of trading days | d                         20                
Common stock purchase warrant | shares                                   1,901,985      
Warrant right exercise price | $ / shares                                   $ 4.75      
Common stock, shares issued | shares                   13,023,330     13,023,330       12,591,084        
Epsilon Acquisitions, LLC [Member]                                          
Debt Instrument [Line Items]                                          
Aggregate amount issuable               $ 6,000,000.0                          
Conversion price of Notes | $ / shares                   $ 3.52     $ 3.52                
Accrued interest                   $ 0 $ 24,931   $ 34,520 $ 49,862              
Conversion of stock, shares Issued | shares 411,562                       411,562                
Aggregate fair value of warrants                         $ 303,712                
Inducement expense                         303,712                
Conversion of stock, amount converted                         $ 1,448,697                
Notes Payable, Other Payables [Member] | Third Tranche [Member]                                          
Debt Instrument [Line Items]                                          
Conversion price of Notes | $ / shares           $ 3.52                              
Conversion of stock, shares Issued | shares           1,000,000                              
Notes Payable, Other Payables [Member] | Fourth Tranche [Member]                                          
Debt Instrument [Line Items]                                          
Conversion price of Notes | $ / shares         $ 4.19                                
Conversion of stock, shares Issued | shares         1,000,000                                
Notes Payable, Other Payables [Member] | Fifth Tranche [Member]                                          
Debt Instrument [Line Items]                                          
Conversion price of Notes | $ / shares       $ 4.13                                  
Conversion of stock, shares Issued | shares       1,000,000                                  
Notes Payable, Other Payables [Member] | MINOSA [Member]                                          
Debt Instrument [Line Items]                                          
Aggregate amount issuable               14,750,000                          
Debt Instrument, acceleration clause description                         The indebtedness may be accelerated upon the occurrence of specified events of default including (a) OME’s failure to pay any amount payable on the date due and payable; (b) OME or we fail to perform or observe any term, covenant, or agreement in the Purchase Agreement or the related documents, subject to a five-day cure period; (c) an event of default or material breach by OME, us or any of our affiliates under any of the other loan documents shall have occurred and all grace periods, if any, applicable thereto shall have expired; (d) the Stock Purchase Agreement shall have been terminated; (e) specified dissolution, liquidation, insolvency, bankruptcy, reorganization, or similar cases or actions are commenced by or against OME or any of its subsidiaries, in specified circumstances unless dismissed or stayed within 60 days; (f) the entry of judgment or award against OME or any of its subsidiaries in excess or $100,000; and (g) a change in control (as defined in the Purchase Agreement) occurs.                
Judgment amount for acceleration of indebtedness               100,000                          
Notes Payable, Other Payables [Member] | Epsilon Acquisitions, LLC [Member]                                          
Debt Instrument [Line Items]                                          
Aggregate amount issuable     $ 6,000,000.0       $ 3,000,000.0 3,000,000.0                       $ 3,000,000.0  
Installment amount of Notes               $ 1,500,000                          
Interest rate, stated percentage             10.00% 10.00%                          
Notes security description                         we granted security interests to Epsilon in (a) the 54 million cuotas (a unit of ownership under Panamanian law) of Oceanica Resources S. de R.L. (“Oceanica”) held by our wholly owned subsidiary, Odyssey Marine Enterprises, Ltd. (“OME”), (b) all notes and other receivables from Oceanica and its subsidiary owed to the Odyssey Pledgors, and (c) all of the outstanding equity in OME.                
Conversion price of Notes | $ / shares             $ 5.00 $ 5.00                         $ 5.00
Conversion price of Notes upon default | $ / shares               $ 2.50                          
Debt instrument maturity date             Mar. 18, 2017 Mar. 18, 2017                          
Pledged units of ownership | Cuota               54         54                
Number of trading days | d             75 75                          
Lender's out of pocket costs                   50,000     $ 50,000                
Accrued interest                       $ 302,274                  
Conversion of stock, shares Issued | shares     670,455                 670,455                  
Beneficial conversion feature recorded                         $ 96,000                
Debt conversion amount   $ 2,000,000.0 $ 2,000,000.0                       $ 2,000,000            
Common stock purchase warrant | shares             120,000                            
Warrant right exercise price | $ / shares             $ 3.52                            
Warrant Expiration Date                         Oct. 01, 2021                
Warrant right exercise price description                         Warrant shall be the number determined by multiplying 120,000 by a fraction, (a) the numerator of which is the aggregate principal amount of advances that have been extended to the OME by Epsilon pursuant to the Restated Note Purchase Agreement on or after the date of the Warrant and prior to the date of such failure and (b) the denominator of which is $3.0 million.                
Equity component in loans payable     3,000,000.0             3,000,000.0     $ 3,000,000.0     $ 3,000,000.0     $ 3,000,000.0    
Amount of loan outstanding                   $ 0     $ 0       $ 1,000,000.0        
Common stock, shares issued | shares                 56,228                        
Shares Issued, Shares, Share-based Payment Arrangement, Forfeited | shares                 63,772                        
Notes Payable, Other Payables [Member] | Epsilon Acquisitions, LLC [Member] | Maximum [Member]                                          
Debt Instrument [Line Items]                                          
Aggregate amount issuable     $ 6,050,000                                    
Notes Payable, Other Payables [Member] | Epsilon Acquisitions, LLC [Member] | Maximum [Member] | Tranche [Member]                                          
Debt Instrument [Line Items]                                          
Conversion of stock, shares Issued | shares             1,388,769