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Convertible Notes (Summary of Convertible Notes) (Detail)
3 Months Ended 12 Months Ended
Nov. 21, 2016
Nov. 20, 2015
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 17, 2019
$ / shares
Nov. 22, 2016
$ / shares
Feb. 12, 2014
Debt Instrument [Line Items]                  
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months       $ 0          
Repayments of Notes Payable       0 $ (126,447,000) $ 0      
Principal amount a $5 incentive cash payment per each to convert debt       1,000          
Convertible Notes and Term Loans, Beginning Balance       124,644,000          
Gains (Losses) on Extinguishment of Debt     $ 3,900,000 8,430,000 0 0      
Convertible Notes and Term Loans, Ending Balance       27,250,000 124,644,000        
Long-term Debt, Maturities, Repayments of Principal in Year Two       19,170,000          
Long-term Debt, Maturities, Repayments of Principal in Year Three       0          
Long-term Debt, Maturities, Repayments of Principal in Year Four       0          
Long-term Debt, Maturities, Repayments of Principal in Year Five       11,500,000          
Long-term Debt, Maturities, Repayments of Principal after Year Five       0          
Long-term Debt       30,670,000          
December 2024 Notes [Member]                  
Debt Instrument [Line Items]                  
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months       $ 0          
Debt Instrument, Interest Rate, Stated Percentage             2.75%    
Debt Instrument, Convertible, Conversion Ratio       262.2951          
Convertible notes, conversion price (in Dollars per Share) | $ / shares             $ 3.81    
Convertible Notes, Principal Balance Outstanding       $ 11,500,000          
Gains (Losses) on Extinguishment of Debt       (2,100,000)          
Long-term Debt, Maturities, Repayments of Principal in Year Two       0          
Long-term Debt, Maturities, Repayments of Principal in Year Three       0          
Long-term Debt, Maturities, Repayments of Principal in Year Four       0          
Long-term Debt, Maturities, Repayments of Principal in Year Five       11,500,000          
Long-term Debt, Maturities, Repayments of Principal after Year Five       0          
Long-term Debt       11,500,000          
February 2018 Notes [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Interest Rate, Stated Percentage                 4.00%
Gains (Losses) on Extinguishment of Debt   $ (6,500,000)              
Amortization of Debt Discount (Premium)       0 293,000 $ 3,449,000      
December 2021 Notes [Member]                  
Debt Instrument [Line Items]                  
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months       0          
Debt Instrument, Interest Rate, Stated Percentage               2.75%  
Debt Instrument, Convertible, Conversion Ratio 262.2951                
Convertible notes, conversion price (in Dollars per Share) | $ / shares               $ 3.81  
Convertible Notes, Principal Balance Outstanding       19,170,000 150,000,000        
Convertible Notes and Term Loans, Beginning Balance       124,644,000          
Gains (Losses) on Extinguishment of Debt       (2,500,000)          
Amortization of Debt Discount (Premium)       459,000 542,000        
Convertible Notes and Term Loans, Ending Balance       16,950,000 $ 124,644,000        
Long-term Debt, Maturities, Repayments of Principal in Year Two       19,170,000          
Long-term Debt, Maturities, Repayments of Principal in Year Three       0          
Long-term Debt, Maturities, Repayments of Principal in Year Four       0          
Long-term Debt, Maturities, Repayments of Principal in Year Five       0          
Long-term Debt, Maturities, Repayments of Principal after Year Five       0          
Long-term Debt       $ 19,170,000