Consolidated Statements of Stockholders' Equity / (Deficit) (Parenthetical) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2013	Dec. 31, 2012
Common stock
Common stock issued on private placement basis		$ 2,348	$ 898
Series A convertible preferred stock
Issuance cost	101
Preferred stock conversion ratio		2.023	2.023
Series B convertible preferred stock
Issuance cost			$ 2,246