Share-Based Payments (Details Textual) - shares	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Employee stock purchase plan maximum shares		6,200,000
1995 ESPP
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Shares issued under ESPP		98,000
2015 ESPP
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Shares issued under ESPP	109,000