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Organization and Business Operations - Additional Information (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 08, 2020
USD ($)
May 05, 2020
USD ($)
$ / shares
shares
Jan. 06, 2020
Feb. 22, 2019
USD ($)
$ / shares
shares
Jan. 25, 2019
$ / shares
Feb. 29, 2020
USD ($)
Mar. 06, 2017
$ / shares
shares
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2020
Dec. 31, 2007
Organization And Business Operations [Line Items]                            
Net sales               $ 497 $ 472 $ 1,282 $ 1,128 $ 3,379    
Type of Revenue [Extensible List]                       us-gaap:ProductMember    
Exercise price of exercisable warrant | $ / shares   $ 1.25                        
Reverse stock split ratio     8                      
Reverse stock split                       1-for-8    
Nasdaq Capital Market [Member]                            
Organization And Business Operations [Line Items]                            
Stock market granted consecutive trading days preceding date of letter         30 days                  
Closing bid price per NASDAQ listing notification letter | $ / shares         $ 1.00                  
Right Offering [Member]                            
Organization And Business Operations [Line Items]                            
Number of shares issued upon right offering | shares       5,976,000     1,706,000              
Proceeds from issuance or sale of equity, total       $ 34,400   $ 34,400                
Share price (in dollars per share) | $ / shares       $ 5.792     $ 11.76              
Exercise price of exercisable warrant | $ / shares       $ 11.76                    
At Market Issuance Sales Agreement [Member]                            
Organization And Business Operations [Line Items]                            
Proceeds from issuance or sale of equity, total               $ 100            
Net sales                       $ 3,400    
Common Stock [Member]                            
Organization And Business Operations [Line Items]                            
Number of shares issued upon right offering | shares   7,500,000                        
Proceeds from issuance or sale of equity, total   $ 6,700                        
Share price (in dollars per share) | $ / shares   $ 1.00                        
Common Stock [Member] | Right Offering [Member]                            
Organization And Business Operations [Line Items]                            
Number of securities called by each warrant or right | shares       1                    
Warrant [Member] | Right Offering [Member]                            
Organization And Business Operations [Line Items]                            
Number of securities called by each warrant or right | shares       1                    
Entities Beneficially Owned by Mr. Gregg Williams [Member] | Right Offering [Member]                            
Organization And Business Operations [Line Items]                            
Number of shares issued upon right offering | shares       5,180,000                    
Proceeds from issuance or sale of equity, total       $ 30,000                    
Second Sight (Switzerland) Sarl [Member]                            
Organization And Business Operations [Line Items]                            
Noncontrolling interest, ownership percentage by parent                         100.00% 99.50%
Second Sight (Switzerland) Sarl [Member] | Executive Officer [Member]                            
Organization And Business Operations [Line Items]                            
Noncontrolling interest, ownership percentage by noncontrolling owners                           0.50%
Chairman Of Board Of Directors [Member]                            
Organization And Business Operations [Line Items]                            
Other borrowings $ 1,000                          
Unaffiliated Shareholders [Member]                            
Organization And Business Operations [Line Items]                            
Other borrowings $ 1,200                          
Number of unaffiliated shareholders two