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Fair Value Measurements. (Tables)
 12 Months Ended
Dec. 31, 2020
Fair Value Disclosures [Abstract]  
Schedule of used and related fair value for the warrants
Original
Issuance		  Exercise
Price		   Volatility   Risk Free
Interest
Rate		   Term
(years)		    Fair Value 
12/22/19  $1.00    178.0%   0.08%       0.10    $8,474 
Original
Issuance		  Exercise
Price		   Volatility   Risk Free
Interest
Rate		   Term
(years)		   Fair Value 
12/22/19  $1.00    76.0%   1.66%   3.00   $977 
Schedule of fair value of pre-funded warrants and other warrants
Warrant Type  Valuation Date  Exercise
Price		   Volatility   Risk Free
Interest
Rate		   Term
(years)		   Fair Value 
Pre-funded  10/28/2020  $0.01    97.0%   0.34%   5.00   $23,638 
Other  10/28/2020  $9.76    134.0%   0.14%   1.50   $27,048 
Pre-funded  11/16/2020  $0.01    97.0%   0.40%   4.95   $21,916 
Other  11/24/2020  $9.76    135.0%   0.13%   1.45   $31,231 
Schedule of fair values of warrants based on unobservable inputs
   Warrants to
Senior
Noteholders		   Pre-funded
Warrants		   Other
Warrants		 
Balance, December 31, 2019  $977   $—   $— 
Issuance of warrants in October offering   —    23,638    27,048 
Exercise of warrants/reclass to equity   (8,474)   (21,917)   (31,231)
Adjustments to fair value for the period   7,497    (1,721)   4,183 
Balance, December 31, 2020  $—   $—   $— 
Schedule of recurring and nonrecurring fair value measurements
   Fair
Value		   Level 1   Level 2   Level 3   Benefit Plan
Percentage
Allocation		 
Assets:                    
Derivative financial instruments  $17,149   $17,149   $—   $—      
Long-lived assets held-for-sale   58,295    —    —    58,295      
Defined benefit plan assets(1) (pooled separate accounts):                         
Large U.S. Equity(2)   5,470    —    5,470    —    31%
Small/Mid U.S. Equity(3)   2,605    —    2,605    —    15%
International Equity(4)   2,921    —    2,921    —    17%
Fixed Income(5)   6,592    —    6,592    —    37%
   $93,032   $17,149   $17,588   $58,295      
                          
Liabilities:                         
   $—   $—   $—   $—      
   Fair
Value		   Level 1   Level 2   Level 3   Benefit Plan
Percentage
Allocation		 
Assets:                    
Derivative financial instruments  $2,438   $2,438   $—   $—      
Long-lived assets held-for-sale   70,400    —    —    70,400      
Defined benefit plan assets(1) (pooled separate accounts):                         
Large U.S. Equity(2)   4,654    —    4,654    —    30%
Small/Mid U.S. Equity(3)   2,348    —    2,348    —    15%
International Equity(4)   2,596    —    2,596    —    17%
Fixed Income(5)   6,056    —    6,056    —    38%
   $88,492   $2,438   $15,654   $70,400      
                          
Liabilities:                         
Derivative financial instruments  $(1,860)  $(1,860)  $—   $—      
Warrants   (977)   —    —    (977)     
   $(2,837)  $(1,860)  $—   $(977)