Convertible Subordinated Notes (Details) - USD ($) shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Sep. 09, 2020	Dec. 31, 2019	Mar. 19, 2014
Debt Instrument [Line Items]
Effect of dilutive securities, Convertible junior subordinated debentures (in shares)	3	0	1	0
Carrying Values of Liability and Equity Components, Convertible Subordinated Notes
Credit Facility amortization of debt issuance costs			$ 592,000	$ 289,000
Accumulated Amortization, Debt Issuance Costs	$ 700,000		$ 700,000			$ 337,000
Convertible Subordinated Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Discount Rate		11.40%
Debt Instrument, Unamortized Debt Issuance Costs	3.20%	3.20%	3.10%	3.20%
Stated interest rate percentage	2.75%		2.75%				2.75%
Carrying Values of Liability and Equity Components, Convertible Subordinated Notes
Convertible subordinated notes, principal amount						6,319,000
Unamortized discount of liability component	$ (35,000)		$ (35,000)			(319,000)
Debt issuance costs	(2,000)		(2,000)			(29,000)
Carrying value of the liability component	2,522,000		2,522,000		$ 2,559,000	5,971,000
Carrying value of the equity component	319,000		319,000			789,000
Convertible subordinated notes, fair value	2,900,000		2,900,000
Contractual coupon interest expense	43,000	$ 43,000	130,000	$ 131,000
Accretion of discount, convertible subordinated notes	69,000	61,000	200,000	178,000
Credit Facility amortization of debt issuance costs	9,000	$ 6,000	21,000	$ 19,000
Accumulated Amortization, Debt Issuance Costs	$ 63,000		$ 63,000			$ 130,000