Statements of Stockholders' Equity (Deficit) (Parenthetical) - USD ($) $ in Thousands		1 Months Ended	12 Months Ended
	Oct. 30, 2013	Oct. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Underwriting discounts and commissions	$ 5,400
Offering costs	$ 3,600		$ 0	$ 0	$ 3,644
Common Stock
Underwriting discounts and commissions			$ 1,496		5,410
IPO
Underwriting discounts and commissions		$ 5,400
Offering costs		$ 3,600			$ 3,600