CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
CONDENSED CONSOLIDATED BALANCE SHEETS
Accounts receivable, allowance for doubtful accounts (in dollars)	$ 618	$ 1,297
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Non-designated common stock, par value (in dollars per share)	$ 0.00005	$ 0.00005
Non-designated common stock, shares authorized	190,000,000	190,000,000
Non-designated common stock, shares issued	22,134,033	21,951,000
Non-designated common stock, shares outstanding	22,134,033	21,951,000