Statements of convertible preferred stock and preferred units, and stockholders' and members' equity (deficit) (Parenthetical) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($)
Series B Preferred Stock [Member]
Issuance of Stock, transaction costs	$ 35
Series B Convertible Preferred Stock [Member]
Issuance of Stock, transaction costs	187
Series D Convertible Preferred Stock [Member]
Issuance of Stock, transaction costs	2,502
Common Stock [Member]
Issuance of Stock, transaction costs	$ 14,206