Notes Payable (Narrative) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		0 Months Ended
	Mar. 31, 2014 Loan and Security Agreement [Member]	Jan. 17, 2012 Loan and Security Agreement [Member]	Sep. 03, 2013 Merger Agreement [Member] Rate	Mar. 31, 2014 Term A Loan [Member] Loan and Security Agreement [Member]	Mar. 31, 2014 Term B Loan [Member] Loan and Security Agreement [Member]
Debt Instrument [Line Items]
Note issuance date	Jan. 17, 2012
Issuance of promissory note as part of merger transaction	$ 10,000,000			$ 4,000,000	$ 6,000,000
Maturity date	Jan. 01, 2016
Fixed interest rate	8.75%
Final payment fee, percentage	3.33%
Interest rate spread	5.00%
Warrants to purchase common shares	1,397,939
Warrants, exercise price		$ 0.29
Warrants, expiration date	Jan. 16, 2022
Exchange ratio			1.1533