Loans Payable And Other Financial Liabilities (Carrying Amounts of Liability and Equity Components - Additional Information) (Details) - Convertible Senior Notes [Member] - USD ($) $ in Thousands |
9 Months Ended | 12 Months Ended | |||
---|---|---|---|---|---|
Sep. 30, 2019 |
Dec. 31, 2018 |
Aug. 31, 2018 |
Aug. 24, 2018 |
Jun. 30, 2014 |
|
2028 Convertible Senior Notes [Member] | |||||
Debt Instrument [Line Items] | |||||
Debt instrument, interest rate | 2.00% | 2.00% | 2.00% | 2.00% | |
Transaction costs related to the equity component | $ 6,163 | ||||
Remaining period over which the unamortized debt discount will be amortized | 9 years | ||||
2019 Convertible Senior Notes [Member] | |||||
Debt Instrument [Line Items] | |||||
Debt instrument, interest rate | 2.25% | 2.25% | |||
Transaction costs related to the equity component | $ 236 | $ 236 |