Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Long-term Purchase Commitment [Line Items]
Operating lease payments	$ 165	$ 191
Future minimum lease commitments	1,681
Pennsylvania [Member]
Long-term Purchase Commitment [Line Items]
Impairment of office lease	225
Accrued expense, impairment of office lease	203
New Jersey [Member]
Long-term Purchase Commitment [Line Items]
Future minimum lease commitments	$ 115