Consolidated Statements of Stockholders' Equity (Net Capital Deficiency) (Parenthetical) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2010
Consolidated Statements of Stockholders' Equity (Net Capital Deficiency)
Issuance of common stock for cash in secondary stock offering, expenses		$ 5.7
Issuance of common stock in private placement to a related party, expenses	$ 0.4	$ 0.2

Represents direct costs (e.g., legal and accounting fees) associated with issuing stock in a private placement that is deducted from additional paid in capital.

No definition available.

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