Annual report pursuant to Section 13 and 15(d)

LONG-TERM DEBT, COMMON STOCK WARRANT LIABILITY, AND SUBSEQUENT EVENT - Common Stock Warrant Liability (Details)

v3.20.4
LONG-TERM DEBT, COMMON STOCK WARRANT LIABILITY, AND SUBSEQUENT EVENT - Common Stock Warrant Liability (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Feb. 12, 2021
USD ($)
May 13, 2016
$ / shares
shares
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Class of Warrant or Right [Line Items]        
Expected contractual term     5 years 4 months 13 days 6 years 4 months 13 days
Fair Value Adjustment of Warrants     $ 598 $ 1,230
Measurement Input, Price Volatility        
Class of Warrant or Right [Line Items]        
Expected stock rate     0.6460 0.4687
Measurement Input, Expected Dividend Rate        
Class of Warrant or Right [Line Items]        
Expected stock rate     0 0
Measurement Input, Risk Free Interest Rate        
Class of Warrant or Right [Line Items]        
Expected stock rate     0.0042 0.0179
Line of Credit | Second Lien Term Loan | Warrant to Purchase Common Equity        
Class of Warrant or Right [Line Items]        
Warrants issued (in shares) | shares   1,006,568    
Warrant exercise price (in dollars per share) | $ / shares   $ 1.67    
Other Nonoperating Expense     $ 600 $ 1,200
Line of Credit | Second Lien Term Loan | Warrant to Purchase Common Equity | Subsequent Event        
Class of Warrant or Right [Line Items]        
Expected Repurchase Price, Warrants $ 6,000      
Payments for Repurchase of Warrants $ 4,000      
Warrants Repurchased Discount Rate Of Closing Price, Percentage 34.00%