Consolidated Statements of Stockholders' Equity (Deficit) (Parenthetical) - Convertible Preferred Stock - Series E Convertible Preferred Stock $ in Thousands	12 Months Ended
	Dec. 31, 2013 USD ($) $ / shares
Convertible preferred stock, exercise price (usd per share) | $ / shares	$ 11.0315
Convertible preferred stock, issuance cost | $	$ 56