Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
LIABILITIES & STOCKHOLDERS' EQUITY
Unamortized discount	$ 3,917	$ 0
Stockholders' Equity:
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	5,000	5,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	43,785,629	43,673,636
Common stock, shares outstanding (in shares)	43,764,737	43,652,744
Treasury stock (at cost) (in shares)	20,892	20,892