Stock Options and Warrants - Rights and Warrants (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Apr. 02, 2014	Mar. 28, 2011	Dec. 31, 2012	Dec. 31, 2011	Nov. 12, 2009	Dec. 31, 2013
Class of Warrant or Right [Line Items]
Exercise price of right (usd per right)		6.25	2.65
Former Chief Executive Officer [Member]
Class of Warrant or Right [Line Items]
Number of shares that may be purchased by warrants (shares)	1,100,000
Exercise price of right (usd per right)	6.00
Litigation expense	$ 5,600,000
Former Chief Executive Officer [Member] | May 10, 2015 [Member]
Class of Warrant or Right [Line Items]
Number of shares that may be purchased by warrants (shares)	83,333
Former Chief Executive Officer [Member] | May 10, 2015 [Member]
Class of Warrant or Right [Line Items]
Number of shares that may be purchased by warrants (shares)	333,333
Former Chief Executive Officer [Member] | May 10, 2020 [Member]
Class of Warrant or Right [Line Items]
Number of shares that may be purchased by warrants (shares)	666,667
Former Chief Executive Officer [Member] | Clause One and Two [Member]
Class of Warrant or Right [Line Items]
Number of shares that may be purchased by warrants (shares)	416,666
Options Matching Right [Member]
Class of Warrant or Right [Line Items]
Exercise price of right (usd per right)						3.42
Aggregate fair value of rights					$ 46,000	$ 673,000
Rights outstanding (shares)				1,300,000
Options Matching Right [Member] | Director
Class of Warrant or Right [Line Items]
Assigned rights (usd per share)						83,333
Rights outstanding (shares)							83,333