Warrants (Details) - Reconciliation of the warrant liability measured at fair value using Level 3 inputs (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Warrants (Details) - Reconciliation of the warrant liability measured at fair value using Level 3 inputs [Line Items]
Balance at beginning of period	$ 10
Re-measurement of common stock warrants	(180)	90
Balance at end of period	939	10
Warrant [Member] | Fair Value, Inputs, Level 3 [Member]
Warrants (Details) - Reconciliation of the warrant liability measured at fair value using Level 3 inputs [Line Items]
Balance at beginning of period	10	100
Issuance of common stock warrants	749
Re-measurement of common stock warrants	180	(90)
Balance at end of period	$ 939	$ 10