Consolidated Statements of Stockholders' Equity (Parenthetical) $ in Thousands	12 Months Ended
	Dec. 31, 2014 USD ($) $ / shares
Issuance of common stock per share | $ / shares	$ 5.80
Common stock issuance cost | $	$ 20
May 2014 [Member]
Issuance of common stock per share | $ / shares	$ 5.25
Common stock issuance cost | $	$ 2,126
October 2014 [Member]
Issuance of common stock per share | $ / shares	$ 9.00
Common stock issuance cost | $	$ 180