Quarterly report pursuant to Section 13 or 15(d)

Stock Based Compensation and Restricted Stock Compensation (Details)

v3.7.0.1
Stock Based Compensation and Restricted Stock Compensation (Details) - USD ($)
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Share-based and Restricted Stock Compensation Expense [Abstract]    
Stock-based compensation expense included in operating expense $ 1,492,000 $ 1,592,000
Stock Options [Member]    
Share-based and Restricted Stock Compensation Expense [Abstract]    
Stock-based compensation expense included in operating expense $ 1,492,000 $ 1,592,000
Share-based Arrangements Awards Granted [Abstract]    
Stock options granted (in shares) 0 1,315,000
Restricted Stock [Member]    
Share-based and Restricted Stock Compensation Expense [Abstract]    
Stock-based compensation expense included in operating expense $ 362,000 $ 1,892,000
Restricted Stock [Member] | Directors and Employees [Member]    
Share-based Arrangements Awards Granted [Abstract]    
Stock options granted (in shares) 0 0
Research and Development [Member] | Stock Options [Member]    
Share-based and Restricted Stock Compensation Expense [Abstract]    
Stock-based compensation expense included in operating expense $ 356,000 $ 341,000
Research and Development [Member] | Restricted Stock [Member]    
Share-based and Restricted Stock Compensation Expense [Abstract]    
Stock-based compensation expense included in operating expense 0 62,000
General and Administrative [Member] | Stock Options [Member]    
Share-based and Restricted Stock Compensation Expense [Abstract]    
Stock-based compensation expense included in operating expense 1,136,000 1,251,000
General and Administrative [Member] | Restricted Stock [Member]    
Share-based and Restricted Stock Compensation Expense [Abstract]    
Stock-based compensation expense included in operating expense $ 362,000 $ 1,830,000