Stockholders' Equity (Details) (USD $) In Thousands, except Share data, unless otherwise specified	1 Months Ended	3 Months Ended	12 Months Ended
	Jul. 31, 2013	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Stockholders' Equity [Abstract]
Common stock, authorized (in shares)			160,000,000	80,000,000
Common stock, par value (in dollars per share)			$ 0.0013	$ 0.0013
Preferred stock, authorized (in shares)			20,000,000	20,000,000
Preferred stock, par value (in dollars per share)			$ 0.001	$ 0.001
Common Stock sold in public offering (in shares)	9,775,000	8,750,000	9,800,000
Proceeds from public offering of common stock, net of underwriting discounts and commissions and offering expenses	$ 40,100	$ 37,500	$ 40,078	$ 23,348	$ 0