Quarterly report pursuant to Section 13 or 15(d)

Stock Option Based Compensation and Restricted Stock Compensation (Details Textual)

v3.7.0.1
Stock Option Based Compensation and Restricted Stock Compensation (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Share-based and Restricted Stock Compensation Expense [Abstract]        
Stock-based compensation expense included in operating expense     $ 2,735,000 $ 2,977,000
Restricted Stock [Member]        
Share-based and Restricted Stock Compensation Expense [Abstract]        
Stock-based compensation expense included in operating expense $ 324,000 $ 987,000 686,000 2,879,000
Employee Stock Option [Member]        
Share-based and Restricted Stock Compensation Expense [Abstract]        
Stock-based compensation expense included in operating expense $ 1,243,000 $ 1,385,000 $ 2,735,000 $ 2,977,000
Share-based Arrangements Awards Granted [Abstract]        
Stock options granted (in shares) 185,000 125,000 185,000 1,440,000