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Debt - Private Placement of Convertible Notes Narrative (Details)
3 Months Ended 12 Months Ended
Mar. 17, 2017
USD ($)
day
instrument
d
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
Dec. 31, 2019
USD ($)
$ / shares
Dec. 31, 2018
USD ($)
$ / shares
Dec. 31, 2017
USD ($)
Jun. 30, 2014
USD ($)
Debt Instrument [Line Items]            
Common stock, par value (usd per share) | $ / shares   $ 0.0001 $ 0.0001 $ 0.0001    
Repayments of debt     $ 83,876,000 $ 16,124,000 $ 1,500,000  
Extinguishment fees     0 0 578,000  
Loss on early extinguishment of debt   $ (1,500,000) $ 1,978,000 $ 79,000 $ 4,969,000  
Convertible Notes            
Debt Instrument [Line Items]            
Face amount           $ 25,000,000.0
Common stock, par value (usd per share) | $ / shares $ 0.0001          
Payment of debt and extinguishment fees $ 5,600,000          
Repayments of debt 5,000,000          
Extinguishment fees 600,000          
Loss on early extinguishment of debt 5,000,000          
Non-cash write off related to settlement of convertible notes $ 46,000,000          
Debt conversion price (in usd per share) | $ / shares $ 7.10          
Debt instrument, convertible, number of equity instruments (in shares) | instrument 3,521,126          
Debt Instrument, convertible, threshold period following issuance date (in years) 3 years          
Debt instrument, convertible, threshold percentage of stock price trigger 125.00%          
Debt instrument, convertible, threshold trading days | day 20          
Debt instrument, convertible, threshold consecutive trading days | d 30          
Interest rate (percent) 8.00%          
Common Stock            
Debt Instrument [Line Items]            
Shares issued (in shares) | shares 3,175,584          
8% Convertible Notes | Convertible Notes            
Debt Instrument [Line Items]            
Original debt amount in debt conversion $ 20,000,000          
Convertible Note Derivative Liability | Convertible Notes            
Debt Instrument [Line Items]            
Original debt amount in debt conversion $ 26,000,000