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Selected Quarterly Financial Data (Unaudited) - Explanatory Information (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Nov. 08, 2018
Nov. 05, 2018
Oct. 26, 2017
Jun. 30, 2017
Feb. 17, 2017
Jul. 28, 2015
Jun. 30, 2017
Feb. 28, 2017
Dec. 31, 2018
Dec. 31, 2017
Conversion Of Convertible Notes | Senior Secured Credit Facility                    
Selected Quarterly Financial Data (Unaudited)                    
Amount of debt converted into stock     $ 6.6              
Conversion price     $ 7.08              
Conversion price, expressed as a percentage of stock price     95.00%              
Number of trading days used to determine conversion stock price   3 days 3 days              
Number of shares of stock into which debt was converted     929,967              
Common Stock                    
Selected Quarterly Financial Data (Unaudited)                    
Issuance of common stock, net of issuance costs (in shares)                 20,651,524 12,019,639
Common Stock | Over-allotment option                    
Selected Quarterly Financial Data (Unaudited)                    
Issuance of common stock, net of issuance costs (in shares) 2,608,695       750,000 720,000        
Common Stock | Underwritten Public Offering                    
Selected Quarterly Financial Data (Unaudited)                    
Issuance of common stock, net of issuance costs (in shares) 19,999,999     4,800,000     4,800,000 5,750,000    
Public offering price (in dollars per share) $ 2.30     $ 6.25     $ 6.25 $ 5.00    
Gross proceeds from issuance of stock       $ 30.0     $ 30.0      
Payments of stock issuance costs       $ 0.2     $ 0.2      
Term of option to purchase share       30 days     30 days      
Shares offered to underwriters under option granted (in shares)       720,000     720,000