Commitments and Contingencies (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Commitments and Contingencies [Line Items]
Operating Leases, Rent Expense	$ 1,479,000	$ 1,633,000
Operating Leases, Income Statement, Sublease Revenue	735,000	$ 369,000
Severance Costs	8,200,000
Letters of Credit	$ 1,109,000
Operating Leases Sublease Term	Feb. 27, 2022
Sublease Agreements [Member]
Commitments and Contingencies [Line Items]
Operating Leases, Income Statement, Sublease Revenue	$ 784,000
Main Headquarters Lease [Member]
Commitments and Contingencies [Line Items]
Lease Expiration Date	Oct. 30, 2027
Office Space Lease [Member]
Commitments and Contingencies [Line Items]
Lease Expiration Date	Feb. 28, 2022