Warrants (Details) (Comcast [Member], USD $)	3 Months Ended			12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2013
Revenue, Major Customer [Line Items]
Warrants issuable, maximum (in shares)	975,000
Warrants, exercise price (in dollars per share)	$ 4.9498
Investment warrants expiration period from issuance date				3 years
Common stock issued (in shares)				490,000
Warrants issued (in shares)		324,000	166,000
Warrant-related charges				$ 777,000
First Tranche [Member]
Fair value assumptions for warrants issued [Abstract]
Risk free interest rate (in hundredths)				0.74%
Expected term				3 years
Volatility (in hundredths)				59.12%
Expected dividend (in hundredths)				0.00%
Second Tranche [Member]
Fair value assumptions for warrants issued [Abstract]
Risk free interest rate (in hundredths)				0.74%
Expected term				3 years
Volatility (in hundredths)				59.12%
Expected dividend (in hundredths)				0.00%
Third Tranche [Member]
Revenue, Major Customer [Line Items]
Warrants issuable, maximum (in shares)	485,000