Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Statement Of Financial Position [Abstract]
Allowance for doubtful accounts	$ 18	$ 25
Accumulated depreciation of property and equipment	$ 714	$ 434
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	100,000,000	1,100,000,000
Common stock, shares issued	27,520,527	26,229,909
Common stock, shares outstanding	27,520,527	26,229,909