Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Statement Of Financial Position [Abstract]
Allowance for doubtful accounts	$ 707	$ 410	[1]
Preferred stock, par value	$ 0.0001	$ 0.0001	[1]
Preferred stock, shares authorized	5,000,000	5,000,000	[1]
Preferred stock, shares issued	0	0	[1]
Preferred stock, shares outstanding	0	0	[1]
Common stock, par value	$ 0.0001	$ 0.0001	[1]
Common stock, shares authorized	145,000,000	145,000,000	[1]
Common stock, shares issued	26,288,419	25,206,498	[1]
Common stock, shares outstanding	26,288,419	25,206,498	[1]

[1] The Condensed Consolidated Balance Sheet as of December 31, 2013 has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements.