Fair Value of Financial Instruments (Warrant Liability) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Hypothetical change in assumed asset volatility		10.00%
Warrant Liability [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Warrant liability balance - beginning of period	$ 13,272		$ 4,446
Exercise of warrants	(10,770)		(10,766)
Change in fair value	300		9,122
Warrant liability balance - end of period	$ 2,802		$ 2,802