Transactions with Affiliates (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Chairman and Chief Executive Officer, and Certain Family Partnerships and Affiliates [Member]
Related Party Transaction [Line Items]
Due to related parties, current	$ 51,000	$ 38,000
Expense reimbursements from related parties	151,000	152,000	152,000
Other Affiliated Entities [Member]
Related Party Transaction [Line Items]
Expense reimbursements from related parties	65,000	69,000	64,000
Expense reimbursements to related parties	42,000	99,000	98,000
Rent expense paid	607,000	481,000
Total study costs incurred	$ 70,420