CONSOLIDATED BALANCE SHEET (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Stockholders’ equity:
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	100,000	100,000
Common stock, shares issued (in shares)	36,358	34,839
Common stock, shares outstanding (in shares)	36,358	34,839