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Stockholders' Equity (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
May 12, 2021
USD ($)
$ / shares
shares
Nov. 06, 2020
USD ($)
$ / shares
shares
Sep. 18, 2020
shares
Jun. 30, 2020
shares
Dec. 24, 2019
USD ($)
$ / shares
shares
Dec. 31, 2021
USD ($)
shares
Dec. 31, 2020
USD ($)
shares
Sep. 17, 2020
shares
Subsidiary, Sale of Stock [Line Items]                
Reverse stock split ratio     0.2          
Common stock, shares outstanding (in shares)     67,231,903     98,039,540 82,575,064 336,159,511
Offering costs | $           $ 118 $ 48  
Number of common stock shares into which each warrant converts (in shares)           1    
Warrants outstanding (in shares)           5,821,137 5,821,137  
Consulting Agreement | Affiliated entity                
Subsidiary, Sale of Stock [Line Items]                
Number of common stock shares into which warrants may be converted (in shares)         3,358,732      
Exercise price of warrants (in dollars per share) | $ / shares         $ 1.44      
Warrants quarterly vesting period         3 years      
Warrants                
Subsidiary, Sale of Stock [Line Items]                
Aggregate intrinsic value | $           $ 6,559 $ 18,260  
Warrants | Consulting Agreement | Affiliated entity                
Subsidiary, Sale of Stock [Line Items]                
Warrants cancelled (in shares)       2,798,945        
Warrants outstanding (in shares)           559,787    
Rights Offering                
Subsidiary, Sale of Stock [Line Items]                
Consideration received on sale of stock | $ $ 75,000              
Shares issued (in shares) 14,312,976              
Sale of stock price (in dollars per share) | $ / shares $ 5.24              
Offering costs | $ $ 159              
Private placement                
Subsidiary, Sale of Stock [Line Items]                
Consideration received on sale of stock | $   $ 50,000     $ 50,000      
Shares issued (in shares)   14,970,060     35,075,690      
Sale of stock price (in dollars per share) | $ / shares   $ 3.34     $ 1.43      
Offering costs | $   $ 48     $ 912      
Number of common stock shares into which warrants may be converted (in shares)         5,261,350      
Exercise price of warrants (in dollars per share) | $ / shares         $ 1.58      
Number of common stock shares into which each warrant converts (in shares)         1      
Minimum volume weighted average common stock price to warrant exercise price, premium, percentage         50.00%