Debt (Details) - Schedule of Long-term Debt Instruments - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
4.875% Convertible Senior Notes Due 2020 [Member]
Debt Instrument [Line Items]
Contractual interest expense	$ 0	$ 0	$ 373
Amortization of debt issuance costs recognized as interest expense	0	0	103
Interest Expense, Debt, Total	0	0	476
4.25% Convertible Senior Notes (due 2018) [Member]
Debt Instrument [Line Items]
Contractual interest expense	32	3,370	5,509
Amortization of debt issuance costs recognized as interest expense	0	460	789
Interest Expense, Debt, Total	32	3,830	6,298
3.25% Convertible Senior Notes (due 2020) [Member]
Debt Instrument [Line Items]
Contractual interest expense	0	580	815
3.25% Convertible Senior Notes Due 2023 [Member]
Debt Instrument [Line Items]
Contractual interest expense	$ 2,004	$ 899	$ 0