Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Current assets
Allowance for doubtful accounts receivable, current	$ 373	$ 373
Stockholders equity
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	25,000	25,000
Preferred stock, shares issued	0	0
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	100,000	100,000
Common stock, shares issued	42,961	32,069
Common stock, shares outstanding	42,961	32,069