XML 78 R56.htm IDEA: XBRL DOCUMENT v3.6.0.2
Common and Preferred Stock - Additional Information (Detail)
 1 Months Ended 12 Months Ended
Mar. 01, 2017
shares
Nov. 09, 2016
shares
Nov. 16, 2015
shares
Feb. 08, 2012
USD ($)
$ / shares
$ / Right
shares
May 31, 2016
USD ($)
$ / shares
shares
Nov. 01, 2015
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Sep. 30, 2016
shares
Oct. 23, 2015
shares
Aug. 14, 2015
USD ($)
Class of Stock [Line Items]                        
Common stock, shares authorized             140,000,000 110,000,000   700,000,000    
Common stock, par value | $ / shares             $ 0.05 $ 0.05        
Undesignated preferred stock, shares authorized             10,000,000 10,000,000        
Undesignated preferred stock, par value | $ / shares             $ 0.01 $ 0.01        
Common stock, shares issued             95,680,831 85,734,188        
Common stock, shares outstanding             95,680,831 85,734,188        
Common stock shares sold aggregate price | $               $ 27,843,000        
Issuance costs associated with the Tel Aviv Stock Exchange | $               548,000        
Percentage of shares of common stock issued for offering     1.15%                  
Restricted warrants issued to purchase number of common stock for offering     31,860                  
Exercise price of restricted warrants per share in connection with the offering | $ / shares         $ 7.50   $ 13.05          
Warrants exercisable period             5 years          
Common stock loaned under share lending agreement, shares                 1,800,000      
Nominal lending fee | $ / shares                 $ 0.05      
Returned shares of common stock under share lending agreement                     1,800,000  
Number of Unit Sold in an Underwritten public offering       7,187,500                
Warrant to purchase of a share of common stock | $ / Right       0.1                
Net proceeds from offering | $       $ 80,600,000                
Proceeds from exercise warrants | $             $ 0 10,123,000 $ 27,779,000      
Warrants expiration, date             Feb. 08, 2016          
Maximum | A Warrants                        
Class of Stock [Line Items]                        
Warrants to purchase of common stock         7,281,553              
Maximum | B Warrants                        
Class of Stock [Line Items]                        
Warrants to purchase of common stock         2,427,184              
Registered Offering                        
Class of Stock [Line Items]                        
Number of shares sold in underwritten public offering         9,708,737              
Direct Offering                        
Class of Stock [Line Items]                        
Proceeds from issuance of warrants | $         $ 50,000,000              
Warrant Liability                        
Class of Stock [Line Items]                        
Exercise price of restricted warrants per share in connection with the offering | $ / shares       $ 12.00                
Number of warrants are exercisable       4,312,500                
Duration for Expiration of warrants       4 years                
Underwriters                        
Class of Stock [Line Items]                        
Number of Unit Sold in an Underwritten public offering       937,500                
Purchased Price of the units by underwriters | $ / Right       11.28                
Public                        
Class of Stock [Line Items]                        
Purchased Price of the units by underwriters | $ / Right       12.00                
Related Party                        
Class of Stock [Line Items]                        
Units sold composition description       Each unit consisting of one share of common stock and a warrant to purchase 0.1 of a share of common stock                
TEL AVIV STOCK EXCHANGE                        
Class of Stock [Line Items]                        
Common stock, shares authorized   10,000,000                    
Percentage of shares price per share   97.00%                    
Common stock shares sold           2,770,487            
Common stock shares sold aggregate price | $           $ 34,710,000   34,710,000        
Share price | $ / shares           $ 13.05            
Issuance costs associated with the Tel Aviv Stock Exchange | $           $ 1,432,000   $ 1,432,000        
Senior convertible notes due August 15, 2015                        
Class of Stock [Line Items]                        
Principal amount | $                 $ 100,000,000     $ 32,100,000
Subsequent Event                        
Class of Stock [Line Items]                        
Stock split of common stock 0.2                      
Common stock, shares authorized 140,000,000