Stockholders' Equity (Narrative) (Details) (USD $)	0 Months Ended	1 Months Ended	12 Months Ended
	Nov. 28, 2011	Apr. 30, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Nov. 02, 2012
Stockholders' Equity and Stock-based Compensation Disclosure [Abstract]
Number of rights						$ 1
Common stock, par value			$ 0.001	$ 0.001		$ 0.001
Preferred stock, par value			$ 0.001	$ 0.001		$ 0.001
Right to purchase preferred stock, conversion ratio						0.001
Right to purchase preferred stock, exercise price						350,000
Percent ownership threshold of common stock to become exercisable			10.00%
Percent ownership threshold of common stock to become exercisable for certain institutional investors			20.00%
Common stock, shares issued	2,900,000
Proceeds from issuance of common stock	$ 200,000,000		$ 124,557,000	$ 4,124,000	$ 19,614,000
Issuance costs	$ 500,000
Common stock, shares issued		2,300,000