Fair Value Measurements and Derivative Instruments (Reconciliation of Items Measured at Fair Value on a Recurring Basis) (Details) - Level 3 [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value, beginning of period	$ (1,058)	$ (711)
Net gains (losses) recognized in earnings	(5,817)	(347)
Purchase and issuances	(10,000)
Fair value, end of period	(16,875)	(1,058)
Total unrealized gains (losses) during the period included in earnings related to instruments held at end of period	(5,817)	(347)
Series E Preferred Embedded Redemption Option [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value, beginning of period	22	289
Net gains (losses) recognized in earnings	(22)	(267)
Fair value, end of period		22
Total unrealized gains (losses) during the period included in earnings related to instruments held at end of period	(22)	(267)
Convertible Debt [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value, beginning of period	(1,080)	(1,000)
Net gains (losses) recognized in earnings	(5,795)	(80)
Purchase and issuances	(10,000)
Fair value, end of period	(16,875)	(1,080)
Total unrealized gains (losses) during the period included in earnings related to instruments held at end of period	$ (5,795)	$ (80)