XML 62 R50.htm IDEA: XBRL DOCUMENT v3.19.1
Stockholders' Equity - Additional Information (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Oct. 04, 2018
USD ($)
$ / shares
shares
Nov. 10, 2010
Item
$ / shares
shares
Oct. 31, 2018
USD ($)
Jul. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2018
$ / shares
shares
Dec. 31, 2017
$ / shares
Feb. 28, 2017
$ / shares
Stockholders Equity [Line Items]              
Shares of common stock issued       1,325,000      
Net proceeds from issuance of common stock | $       $ 1,987,000      
Sale of Stock, Price Per Share | $ / shares       $ 1.70      
Warrants available to purchase       662,500      
Exercise price of warrants | $ / shares $ 0.30 $ 4.80   $ 2.35      
Warrants expiration date         Jan. 06, 2023    
Gross proceeds from units offering | $ $ 11,100            
Units offered during the period 36,910,809            
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 $ 0.001       $ 0.001 $ 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 $ 0.12            
Warrants outstanding         36,910,809    
Warrants exercisable         36,910,809    
Senior Secured Convertible Notes due August 15 2018              
Stockholders Equity [Line Items]              
Payment on principle amount of note | $ $ 7,400   $ 7,400        
Common Units              
Stockholders Equity [Line Items]              
Units offered during the period 8,065,000            
Units offered during the period, price per unit | $ / shares $ 0.30            
Pre-funded Units              
Stockholders Equity [Line Items]              
Units offered during the period 28,845,809            
Units offered during the period, price per unit | $ / shares $ 0.30            
Warrants outstanding         2,310,776    
Warrants exercisable         2,310,776