CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cashless exercise of underwriter warrants (in dollars per share)		$ 4.80
Issued at $3.93-3.59 per share [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock issued for cash exercise of warrants at per share, net - minimum (in dollars per share)	$ 3.59	$ 3.59
Stock issued for cash exercise of warrants at per share, net - maximum (in dollars per share)	$ 3.93	$ 3.93