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Subsequent Event - Additional Information (Details)
$ / shares in Units, $ in Millions
Feb. 28, 2020
USD ($)
$ / shares
shares
Feb. 28, 2020
€ / shares
Dec. 31, 2019
$ / shares
shares
Dec. 31, 2018
$ / shares
shares
Subsequent Event [Line Items]        
Common stock, shares | shares     61,718,000 43,518,000
Common stock, par value | $ / shares     $ 0.0001 $ 0.0001
Subsequent Event | Commitment Letter | Perceptive Credit Holdings III, LP        
Subsequent Event [Line Items]        
Secured debt financing | $ $ 130      
Subsequent Event | Commitment Letter | Perceptive Credit Holdings III, LP | Refinancing Warrants        
Subsequent Event [Line Items]        
Percentage of warrant price per share 50.00%      
Volume weighted average price, period 5 days      
Warrant floor price per share | $ / shares $ 4.60      
Percentage of remaining warrant price per share 50.00%      
Percentage of warrant premium 12.50%      
Subsequent Event | Commitment Letter | Perceptive Credit Holdings III, LP | Tender Offer Warrants        
Subsequent Event [Line Items]        
Percentage of warrant price per share 50.00%      
Volume weighted average price, period 5 days      
Warrant floor price per share | $ / shares $ 4.60      
Percentage of remaining warrant price per share 50.00%      
Percentage of warrant premium 12.50%      
Subsequent Event | Commitment Letter | Perceptive Credit Holdings III, LP | Supplemental Warrants        
Subsequent Event [Line Items]        
Percentage of warrant price per share 50.00%      
Volume weighted average price, period 5 days      
Warrant floor price per share | $ / shares $ 4.60      
Percentage of remaining warrant price per share 50.00%      
Percentage of warrant premium 12.50%      
Subsequent Event | Commitment Letter | Refinancing Portion | Perceptive Credit Holdings III, LP        
Subsequent Event [Line Items]        
Percentage of aggregate principal amount 18.50%      
Subsequent Event | Commitment Letter | Refinancing Portion | Perceptive Credit Holdings III, LP | Maximum        
Subsequent Event [Line Items]        
Secured debt financing | $ $ 60      
Subsequent Event | Commitment Letter | Tender Offer Portion | Perceptive Credit Holdings III, LP        
Subsequent Event [Line Items]        
Secured debt financing | $ $ 70      
Percentage of aggregate principal amount 9.00%      
Subsequent Event | Commitment Letter | Tender Offer Portion | Perceptive Credit Holdings III, LP | Maximum        
Subsequent Event [Line Items]        
Secured debt financing | $ $ 100      
Subsequent Event | Commitment Letter | Supplemental Portion | Perceptive Credit Holdings III, LP        
Subsequent Event [Line Items]        
Percentage of aggregate principal amount 9.00%      
Subsequent Event | Commitment Letter | Supplemental Portion | Perceptive Credit Holdings III, LP | Maximum        
Subsequent Event [Line Items]        
Secured debt financing | $ $ 15      
Subsequent Event | Tender Offer Agreement | EOS Imaging S.A        
Subsequent Event [Line Items]        
Share price | € / shares   € 0.01    
Tender offer price | (per share) $ 3.08 2.80    
Common stock, shares | shares 0.50      
Common stock, par value | $ / shares $ 0.0001      
Subsequent Event | Tender Offer Agreement | OCEANEs | EOS Imaging S.A        
Subsequent Event [Line Items]        
Tender offer price | (per share) $ 7.71 € 7.01