Quarterly report pursuant to Section 13 or 15(d)

Share-Based Compensation (Details Textual)

Share-Based Compensation (Details Textual)
$ in Millions
6 Months Ended
Jun. 30, 2017
USD ($)
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Number of active share based compensation plans | plan 2
Unrecognized compensation expense related to unvested portion of stock options | $ $ 15.7
Weighted average period of recognition of unrecognized compensation expense 2 years 2 months