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Stockholders' Equity - Additional Information (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Oct. 31, 2018
USD ($)
$ / shares
shares
Jul. 31, 2017
USD ($)
$ / shares
shares
Nov. 30, 2010
Item
$ / shares
shares
Dec. 31, 2019
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
Stockholders Equity [Line Items]          
Shares of common stock issued   66,250      
Net proceeds from issuance of common stock | $   $ 1,987,000      
Sale of Stock, Price Per Share | $ / shares   $ 34.00      
Warrants available to purchase   33,125      
Exercise price of warrants | $ / shares $ 6.00 $ 47.00 $ 4.80    
Warrants expiration date       Jan. 06, 2023  
Gross proceeds from units offering | $ $ 11,100        
Payment on principle amount of note | $         $ 7,365
Units offered during the period 1,845,540        
Common stock warrants expiration date       Oct. 04, 2023  
Number of shares of common stock included in each common unit 1        
Number of warrant to purchase share of common included in each common unit 1        
Number of common stock warrant included in each pre-funded unit 1        
Number of warrant to purchase share of common stock included in each pre-funded unit 1        
Common stock, par value (in dollars per share) | $ / shares $ 0.02     $ 0.001 $ 0.001
Number of preferred share purchase rights declared as dividend for each outstanding share of common stock | Item     1    
Number of shares of Series AA Preferred Stock that a registered holder of right is entitled to purchase     0.001    
Percentage of the company's common stock acquired by a third party upon which the rights become exercisable     15.00%    
Minimum percentage of the company's common stock that must receive a tender offer from a third party upon which the rights become exercisable     15.00%    
Common Stock Warrants          
Stockholders Equity [Line Items]          
Beneficial ownership maximum percentage of outstanding common stock 9.99%        
Exercise price per share minimum | $ / shares $ 2.40        
Warrants outstanding       1,845,540  
Warrants exercisable       1,845,540  
Senior Secured Convertible Notes due August 15 2018          
Stockholders Equity [Line Items]          
Payment on principle amount of note | $ $ 7,400        
Common Units          
Stockholders Equity [Line Items]          
Units offered during the period 403,250        
Units offered during the period, price per unit | $ / shares $ 6.00        
Pre-funded Units          
Stockholders Equity [Line Items]          
Units offered during the period 1,442,290        
Units offered during the period, price per unit | $ / shares $ 6.00        
Warrants outstanding       115,539  
Warrants exercisable       115,539