Stockholders' Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified	6 Months Ended	2 Months Ended	3 Months Ended	1 Months Ended		3 Months Ended	6 Months Ended	1 Months Ended
	Jun. 30, 2014 Vote	Apr. 30, 2014 At The Market Issuance Sales Agreement [Member]	Jun. 30, 2014 At The Market Issuance Sales Agreement [Member]	Jul. 31, 2014 At The Market Issuance Sales Agreement [Member] Subsequent Event [Member]	Aug. 06, 2014 At The Market Issuance Sales Agreement [Member] Subsequent Event [Member]	Jul. 31, 2014 At The Market Issuance Sales Agreement [Member] Subsequent Event [Member]	Jun. 30, 2014 M L V And Co L L C [Member] Maximum [Member] At The Market Issuance Sales Agreement [Member]	Apr. 30, 2014 Directors Including Largest Shareholder [Member] Registered Direct Offering [Member]
Common Stock
Number of votes per share that common stockholders are entitled to receive	1
Common Stock Issued
Number of shares sold by the entity		6,588,875	8,060,244	1,363,949	1,656,750	9,424,193		1,250,000
Selling price per share (in dollars per share)								$ 4.01
Value of shares sold by the entity		$ 28.0			$ 6.7	$ 40.0
Net proceeds after deducting commissions and other transactions costs		27.3	33.6	5.6	6.6	39.2		5.0
Percentage of gross proceeds payable as commission							3.00%
Weighted average selling price (in dollars per share)		$ 4.25			$ 4.06	$ 4.24
Maximum aggregate offering price				$ 50