Reduction in Staff (Details)	1 Months Ended	3 Months Ended
	Sep. 30, 2015 USD ($)	Sep. 30, 2015 USD ($)
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Percent of workforce reduction	30.00%
Costs related to staff reduction plan	$ 910,000	$ 910,000
Employee Severance [Member] | Research and Development [Member]
Restructuring Cost and Reserve [Line Items]
Reduction in force costs	682,000
Employee Severance [Member] | General and Administrative [Member]
Restructuring Cost and Reserve [Line Items]
Reduction in force costs	228,000
Post-termination Option Exercise Period [Member]
Restructuring Cost and Reserve [Line Items]
Costs related to staff reduction plan	303,000	303,000
Other Current Liabilities [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Severance benefits paid		372,000
Unpaid severance costs	$ 235,000	$ 235,000