Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements (Narrative) (Details)

v3.23.2
Fair Value Measurements (Narrative) (Details)
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jan. 27, 2023
USD ($)
$ / shares
shares
Dec. 30, 2022
USD ($)
shares
Dec. 16, 2022
USD ($)
Oct. 11, 2022
USD ($)
$ / shares
shares
Feb. 28, 2023
USD ($)
$ / shares
shares
Jun. 30, 2023
USD ($)
$ / shares
Jun. 30, 2023
USD ($)
$ / shares
Jun. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Jun. 13, 2023
$ / shares
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Estimated fair value of retained investment           $ 2,600,000 $ 2,600,000      
Sale of stock, net proceeds   $ 150,000,000     $ 6,700,000          
Gain (loss) on common stock warrant liabilities           512,000 (6,166,000)      
Common stock, value           132,000 132,000   $ 110,000  
Stock offering, price per share | $ / shares         $ 5.25          
Stock offering, number of shares issued | shares   4,900,000     1,180,000          
Common stock warrant liabilities           $ 9,971,000 9,971,000   13,869,000  
Number of shares called by warrants | shares         1          
Exercise price of warrants | $ / shares                   $ 0.5424
Proceeds from issuance of common stock for at-the-market offering, net             $ 1,168,000 $ 5,527,000    
Share Price                    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Retained investment, deconsolidated subsidiary, measurement input | $ / shares           0.328 0.328      
Risk-free rate                    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Retained investment, deconsolidated subsidiary, measurement input           0.037 0.037      
Volatility                    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Retained investment, deconsolidated subsidiary, measurement input           0.80 0.80      
Discount for lack of marketability                    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Retained investment, deconsolidated subsidiary, measurement input           0.397 0.397      
Pre funded warrants                    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Stock offering, price per share | $ / shares         $ 5.2499          
Checkpoint Common Stock Warrants                    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Fair value of warrants     $ 7,900,000              
Checkpoint Common Stock Warrants | Common Stock Warrant                    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Gain (loss) on common stock warrant liabilities     (1,200,000)       $ 7,200,000      
Net proceeds     6,700,000              
Checkpoint Common Stock Warrants | 2022 Director Offering                    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Sale of stock, net proceeds     $ 6,700,000              
Avenue                    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Stock offering, number of shares issued | shares 448,000                  
Shares issued | shares       3,636,365            
Number of common stock (in units)       1            
Number of warrants (in units)       1            
Warrants issued | shares       545,454            
Unit Price Per Share | $ / shares $ 1.55                  
Proceeds from issuance of common stock for at-the-market offering, net       $ 10,400,000            
Avenue | Contingent Conditions are Met [Member]                    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Net proceeds $ 2,800,000                  
Stock offering, number of shares issued | shares 1,940,299                  
Common stock warrant liabilities $ 2,200,000                  
Number of shares called by warrants | shares 1                  
Exercise price of warrants | $ / shares $ 0.125                  
Unit Price Per Share | $ / shares 1.55                  
Avenue | Pre funded warrants                    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Exercise price of warrants | $ / shares 0.0001     $ 0.0001            
Unit Price Per Share | $ / shares $ 1.5499     $ 3.2999            
Avenue | Common Stock and Pre-funded Warrants                    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Number of warrants (in units)       1            
Unit Price Per Share | $ / shares       $ 3.30            
Common Stock Warrant                    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Common stock warrant liabilities           $ 9,971,000 9,971,000   13,869,000  
Common Stock Warrant | Checkpoint Common Stock Warrants                    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Gain (loss) on common stock warrant liabilities             (7,209,000)      
Common stock warrant liabilities           3,961,000 3,961,000   11,170,000  
Common Stock Warrant | Avenue                    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Issuance of Warrants             2,235,000   8,300,000  
Gain (loss) on common stock warrant liabilities             1,028,000      
Common stock warrant liabilities           5,872,000 5,872,000   2,609,000  
Common Stock Warrant | Avenue | Pre funded warrants                    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Number of shares called by warrants | shares 1,492,299                  
Common Stock Warrant | Urica                    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Gain (loss) on common stock warrant liabilities             15,000      
Placement Agent Warrants | Urica                    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Issuance of Warrants             33,000      
Contingent Payment Warrants | Urica                    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Fair value of warrants           $ 100,000 $ 100,000   $ 100,000