Annual report pursuant to Section 13 and 15(d)

Capitalization and Equity Structure - Schedule of Warrant Share Activity (Details)

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Capitalization and Equity Structure - Schedule of Warrant Share Activity (Details) - $ / shares
shares in Thousands
1 Months Ended 12 Months Ended
May 24, 2019
Dec. 31, 2019
Dec. 31, 2019
Class Of Warrant Or Right, Outstanding [Roll Forward]      
Warrants Outstanding (in shares)     3,396
Warrants Issued (in shares)     15,778
Warrants Expired (in shares)     (1,504)
Warrants Exercised (in shares)     0
Warrants Outstanding (in shares)   17,670 17,670
December 2019 Warrants      
Schedule of Capitalization, Equity [Line Items]      
Exercise price (in dollars per share)   $ 0.5402 $ 0.5402
Term (Years)     5 years
Class Of Warrant Or Right, Outstanding [Roll Forward]      
Warrants Outstanding (in shares)     0
Warrants Issued (in shares)     8,333
Warrants Expired (in shares)     0
Warrants Exercised (in shares)     0
Warrants Outstanding (in shares)   8,333 8,333
December 2019 Placement Agent Warrants      
Schedule of Capitalization, Equity [Line Items]      
Exercise price (in dollars per share)   $ 0.5625 $ 0.5625
Term (Years)   5 years 5 years
Class Of Warrant Or Right, Outstanding [Roll Forward]      
Warrants Outstanding (in shares)     0
Warrants Issued (in shares)   778  
Warrants Expired (in shares)     0
Warrants Exercised (in shares)     0
Warrants Outstanding (in shares)   778 778
May 2019 Warrants      
Schedule of Capitalization, Equity [Line Items]      
Exercise price (in dollars per share)   $ 0.38 $ 0.38
Term (Years) 5 years   5 years
Class Of Warrant Or Right, Outstanding [Roll Forward]      
Warrants Outstanding (in shares)     0
Warrants Issued (in shares)     6,667
Warrants Expired (in shares)     0
Warrants Exercised (in shares)     0
Warrants Outstanding (in shares)   6,667 6,667
2017 Information Agent Warrants      
Schedule of Capitalization, Equity [Line Items]      
Exercise price (in dollars per share)   $ 1.5 $ 1.5
Term (Years)     3 years
Class Of Warrant Or Right, Outstanding [Roll Forward]      
Warrants Outstanding (in shares)     200
Warrants Issued (in shares)     0
Warrants Expired (in shares)     0
Warrants Exercised (in shares)     0
Warrants Outstanding (in shares)   200 200
December 2015 Warrants      
Schedule of Capitalization, Equity [Line Items]      
Exercise price (in dollars per share)   $ 2.75 $ 2.75
Term (Years)     5 years
Class Of Warrant Or Right, Outstanding [Roll Forward]      
Warrants Outstanding (in shares)     1,604
Warrants Issued (in shares)     0
Warrants Expired (in shares)     0
Warrants Exercised (in shares)     0
Warrants Outstanding (in shares)   1,604 1,604
Placement agent warrants      
Schedule of Capitalization, Equity [Line Items]      
Exercise price (in dollars per share)   $ 7 $ 7
Term (Years)     5 years
Class Of Warrant Or Right, Outstanding [Roll Forward]      
Warrants Outstanding (in shares)     426
Warrants Issued (in shares)     0
Warrants Expired (in shares)     (426)
Warrants Exercised (in shares)     0
Warrants Outstanding (in shares)   0 0
PPO warrants      
Schedule of Capitalization, Equity [Line Items]      
Exercise price (in dollars per share)   $ 14 $ 14
Term (Years)     5 years
Class Of Warrant Or Right, Outstanding [Roll Forward]      
Warrants Outstanding (in shares)     1,078
Warrants Issued (in shares)     0
Warrants Expired (in shares)     (1,078)
Warrants Exercised (in shares)     0
Warrants Outstanding (in shares)   0 0
Pre-2014 warrants      
Schedule of Capitalization, Equity [Line Items]      
Exercise price (in dollars per share)   $ 9.66 $ 9.66
Class Of Warrant Or Right, Outstanding [Roll Forward]      
Warrants Outstanding (in shares)     88
Warrants Issued (in shares)     0
Warrants Expired (in shares)     0
Warrants Exercised (in shares)     0
Warrants Outstanding (in shares)   88 88
Pre-2014 warrants | Minimum      
Schedule of Capitalization, Equity [Line Items]      
Term (Years)     9 years
Pre-2014 warrants | Maximum      
Schedule of Capitalization, Equity [Line Items]      
Term (Years)     10 years