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Warrants to Acquire Shares of Common Stock (Fair Value of Warrants is Estimated Using Black-Scholes Option Pricing Model) (Details) - $ / shares shares in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Class of Warrant or Right [Line Items]
Warrants outstanding (in shares)	19,224	963
Series A Convertible Preferred
Class of Warrant or Right [Line Items]
Warrants outstanding (in shares)	1,384	0
Strike price (in usd per share)	$ 2.10
Expected term (years)	5 years 4 days
Volatility %	83.18%
Risk-free rate %	2.94%
Galena February 2017
Class of Warrant or Right [Line Items]
Warrants outstanding (in shares)	32	567
Strike price (in usd per share)	$ 33	$ 13
Expected term (years)	3 years 4 months 17 days	4 years 1 month 13 days
Volatility %	85.39%	79.29%
Risk-free rate %	2.25%	2.09%
Galena Other
Class of Warrant or Right [Line Items]
Warrants outstanding (in shares)	74	80
Strike price (in usd per share)	$ 888.22	$ 28.4
Expected term (years)	2 years 8 months 5 days	3 years 2 months 9 days
Volatility %	85.96%	74.05%
Risk-free rate %	2.32%	2.09%