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Note 4 - Debt and Finance Leases (Details Textual) - USD ($)
6 Months Ended
Jun. 15, 2022
Feb. 26, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Debt And Capital Leases [Line Items]          
Net proceeds from Term Loan Credit Agreement     $ 49,000,000 $ 215,000,000  
Holder fundamental transaction election period   30 days      
2021 Convertible Notes Embedded Derivative [Member]          
Debt And Capital Leases [Line Items]          
Net proceeds received to derivative liability   $ 12,000,000      
Fair value of derivative liability     4,000,000   $ 4,000,000
2021 Convertible Notes [Member]          
Debt And Capital Leases [Line Items]          
Debt instrument interest rate   5.00%      
Debt instrument, aggregate principal amount   $ 25,000,000      
Debt instrument, maturity date   May 28, 2026      
Initial conversion rate, number of shares of common stock per each principal amount of Convertible Notes   100      
Debt instrument, principal amount of conversion calculation   $ 1,000      
Initial conversion price per share of common stock   $ 10.00      
Convertible notes, terms of conversion features   The Buyers have the right to elect at any time to convert the Convertible Notes into shares of Common Stock at an initial conversion rate equal to 100 shares of Common Stock per each $1,000 principal amount of the Convertible Notes (based on an initial conversion price equal to $10.00 per share of Common Stock). The conversion rate and conversion price will be subject to certain customary anti-dilution adjustments.      
Closing price of Common Stock equals or exceeds   $ 14.50      
Carrying value of convertible notes     16,000,000   15,000,000
Convertible notes unamortized discount     10,000,000   $ 11,000,000
Estimated fair value of the convertible notes     $ 16,000,000    
2021 Convertible Notes [Member] | Minimum [Member]          
Debt And Capital Leases [Line Items]          
Trading days   45 days      
2021 Convertible Notes [Member] | Maximum [Member]          
Debt And Capital Leases [Line Items]          
Trading days   60 days      
Term Loan Credit Agreement          
Debt And Capital Leases [Line Items]          
Long-term debt $ 50,000,000 $ 225,000,000      
Long-term debt, maximum additional proceeds   50,000,000      
Net proceeds from Term Loan Credit Agreement 49,000,000 215,000,000      
Debt transaction costs $ 1,000,000 $ 10,000,000      
Long-term debt, maturity date   Feb. 26, 2026      
Debt instrument interest rate   12.50%      
Term Loan Credit Agreement | Term Loans [Member] | Paid-In-Cash Interest [Member]          
Debt And Capital Leases [Line Items]          
Debt instrument interest rate   8.50%      
Term Loan Credit Agreement | Term Loans [Member] | Paid-In-Kind Interest [Member]          
Debt And Capital Leases [Line Items]          
Debt instrument interest rate   4.00%      
Term Loan Credit Agreement | U.S. [Member] | Subsidiaries [Member]          
Debt And Capital Leases [Line Items]          
Percentage of material stock   100.00%      
Term Loan Credit Agreement | Foreign [Member] | Subsidiaries [Member]          
Debt And Capital Leases [Line Items]          
Percentage of material stock   65.00%