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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, 2020
Dec. 31, 2019
Class of Warrant or Right [Line Items]    
Warrants outstanding (in shares) 3,864 302
Series A Convertible Preferred    
Class of Warrant or Right [Line Items]    
Warrants outstanding (in shares) 19 19
Strike price (in dollars per share) $ 7.50 $ 7.50
Expected term (years) 3 years 3 years 9 months
Volatility % 131.54% 112.84%
Risk-free rate % 0.16% 1.64%
Galena February 2017    
Class of Warrant or Right [Line Items]    
Warrants outstanding (in shares) 1 1
Strike price (in dollars per share) $ 1,650.00 $ 1,650.00
Expected term (years) 1 year 4 months 13 days 2 years 1 month 13 days
Volatility % 135.60% 114.91%
Risk-free rate % 0.13% 1.64%
Galena Other    
Class of Warrant or Right [Line Items]    
Warrants outstanding (in shares) 2 3
Strike price (in dollars per share) $ 30,901.09 $ 41,494.00
Expected term (years) 1 year 3 months 14 days 1 year 5 months 4 days
Volatility % 135.60% 114.91%
Risk-free rate % 0.13% 1.64%