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Note 7 - Debt (Details Textual)
1 Months Ended 3 Months Ended 6 Months Ended 47 Months Ended
May 31, 2021
USD ($)
shares
Feb. 28, 2019
USD ($)
$ / shares
shares
Feb. 28, 2018
USD ($)
$ / shares
Mar. 31, 2023
USD ($)
Jun. 30, 2023
USD ($)
shares
Dec. 31, 2016
USD ($)
shares
Jun. 29, 2023
USD ($)
Jan. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Jun. 30, 2022
USD ($)
Mar. 31, 2022
USD ($)
Jan. 01, 2022
USD ($)
Dec. 31, 2021
USD ($)
Feb. 01, 2019
USD ($)
Nov. 30, 2015
USD ($)
Retained Earnings (Accumulated Deficit)         $ (1,860,830,000)       $ (1,822,923,000)            
Additional Paid in Capital         3,427,094,000       3,421,872,000            
Line of Credit Facility, Maximum Borrowing Capacity         80,028,000                    
Equity, Attributable to Parent       $ 1,551,810,000 1,535,348,000       1,561,648,000 $ 1,718,799,000 $ 1,614,883,000   $ 1,685,126,000    
Goodwill         597,375,000       595,851,000            
Intangible Assets, Net (Excluding Goodwill)         782,195,000       $ 823,520,000            
BioReference [Member]                              
Equity, Attributable to Parent         525,700,000                    
Goodwill         283,000,000.0                    
Intangible Assets, Net (Excluding Goodwill)         $ 177,900,000                    
Minimum [Member]                              
Long-Term Debt, Percentage Bearing Variable Interest, Percentage Rate         0.70%                    
Maximum [Member]                              
Long-Term Debt, Percentage Bearing Variable Interest, Percentage Rate         5.10%                    
Accounting Standards Update 2020-06 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]                              
Retained Earnings (Accumulated Deficit)                       $ (17,500,000)      
Additional Paid in Capital                       (39,100,000)      
Equity, Attributable to Parent                         $ (21,642,000)    
Conversion of the 2025 Notes into Common Stock [Member]                              
Debt Conversion, Original Debt, Amount $ 55,400,000                            
Debt Conversion, Converted Instrument, Shares Issued (in shares) | shares 19,051,270                            
Line of Credit [Member]                              
Debt, Weighted Average Interest Rate         8.80%       5.40%            
The 2025 Notes [Member] | Accounting Standards Update 2020-06 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]                              
Convertible Debt                       $ 21,600,000      
The 2025 Notes [Member] | Convertible Debt [Member]                              
Debt Instrument, Face Amount   $ 200,000,000.0                          
Debt Instrument, Interest Rate, Stated Percentage   4.50%                          
Debt Instrument, Convertible, Conversion Ratio   236.7424                          
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ / shares   $ 4.22                          
Debt Instrument, Convertible Debt, Maximum Shares Issuable (in shares) | shares   30,000,000                          
Debt Instrument, Convertible Debt, Increase (Decrease) in Maximum Shares Issuable (in shares) | shares 8,105,175                            
Debt Conversion, Converted Instrument, Shares Outstanding (in shares) | shares         21,144,825                    
Proceeds From Convertible Debt, Conversion Fee   $ 300,000                          
The 2025 Notes [Member] | Convertible Debt [Member] | Debt Instrument, Redemption, Period One [Member]                              
Debt Instrument, Convertible, Threshold Trading Days   20                          
Debt Instrument, Convertible, Threshold Consecutive Trading Days   30                          
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger   130.00%                          
Debt Instrument, Redemption Price, Percentage   100.00%                          
The 2025 Notes [Member] | Convertible Debt [Member] | Debt Instrument, Redemption, Period Two [Member]                              
Debt Instrument, Convertible, Threshold Trading Days   5                          
Debt Instrument, Convertible, Threshold Consecutive Trading Days   5                          
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger   98.00%                          
The 2025 Notes [Member] | Convertible Debt [Member] | Debt Instrument, Redemption, Period Three [Member]                              
Debt Instrument, Convertible, Threshold Trading Days   20                          
Debt Instrument, Convertible, Threshold Consecutive Trading Days   30                          
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger   130.00%                          
Debt Instrument, Redemption Price, Percentage   100.00%                          
The 2023 Convertible Notes [Member] | Convertible Debt [Member]                              
Debt Instrument, Face Amount     $ 55,000,000.0                        
Debt Instrument, Interest Rate, Stated Percentage     5.00%                        
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ / shares     $ 5.00                        
Debt Instrument, Term (Year)     5 years                        
Debt Instrument, Convertible, Conversion Premium, Percent     25.00%                        
Debt Instrument, Convertible, Conversion Premium, Per Share (in dollars per share) | $ / shares     $ 1.66                        
The 2023 Convertible Notes [Member] | Convertible Debt [Member] | Minimum [Member]                              
Debt Instrument, Convertible, Conversion Notice Threshold (Day)     30 days                        
The 2023 Convertible Notes [Member] | Convertible Debt [Member] | Maximum [Member]                              
Debt Instrument, Convertible, Conversion Notice Threshold (Day)     60 days                        
The 2033 Senior Notes [Member] | Convertible Debt [Member]                              
Debt Conversion, Converted Instrument, Shares Issued (in shares) | shares           21,539,873                  
Debt Conversion, Converted Instrument, Amount           $ 143,200,000                  
Debt Instrument, Repurchase Amount                           $ 28,800,000  
Repayments of Convertible Debt       $ 3,000,000.0                      
The 2033 Senior Notes [Member] | Senior Notes [Member]                              
Debt Instrument, Face Amount               $ 175,000,000.0              
Debt Instrument, Interest Rate, Stated Percentage               3.00%              
Credit Agreement [Member] | Line of Credit [Member] | Revolving Credit Facility [Member]                              
Line of Credit Facility, Maximum Borrowing Capacity             $ 50,000,000               $ 75,000,000
Line of Credit Facility, Remaining Borrowing Capacity         $ 13,300,000                    
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage         0.40%                    
Long-Term Line of Credit, Noncurrent         $ 13,300,000       $ 18,100,000            
Credit Agreement [Member] | Line of Credit [Member] | Revolving Credit Facility [Member] | Quarterly Availability is 50% or More [Member]                              
Line of Credit Facility, Commitment Fee Percentage         1.00%                    
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage         0.275%                    
Credit Agreement [Member] | Line of Credit [Member] | Revolving Credit Facility [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]                              
Debt Instrument, Basis Spread on Variable Rate         2.50%                    
Debt Instrument, Basis Spread on Variable Rate, Benchmark Adjustment         0.10%                    
Credit Agreement [Member] | Line of Credit [Member] | Revolving Credit Facility [Member] | Secured Overnight Financing Rate 12 Months [Member]                              
Debt Instrument, Basis Spread on Variable Rate         0.10%                    
Credit Agreement [Member] | Line of Credit [Member] | Bridge Loan [Member]                              
Line of Credit Facility, Maximum Borrowing Capacity                             20,000,000.0
Credit Agreement [Member] | Line of Credit [Member] | Letter of Credit [Member]                              
Line of Credit Facility, Maximum Borrowing Capacity                             $ 20,000,000.0
Notes and Other Debt [Member]                              
Debt, Weighted Average Interest Rate         4.00%       3.50%