Annual report pursuant to Section 13 and 15(d)

SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)

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SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 18, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Warrant liability $ 2,205,000 $ 19,061,000 $ 29,841,000
Gain on remeasurement of warrant liability (16,856,000) (10,780,000)  
Allowance for doubtful accounts 917,000 0  
Impairment of intangible assets, finite-lived $ 0 $ 0  
Minimum | Market-based Restricted Share Units      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Expected life (in years) 1 year 3 months 18 days    
Maximum | Market-based Restricted Share Units      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Expected life (in years) 3 years 9 months 18 days    
Private Placement      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Gain on remeasurement of warrant liability $ (16,856,000)    
Accounts Receivable | Customer Concentration Risk | Three Customers      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Concentration risk, percentage 43.00% 74.00%  
Common stock warrants      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Warrant, outstanding (in shares) 12,877,361   13,000,000
Private Placement      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Warrant, outstanding (in shares) 4,900,000   4,900,000