Consolidated Statements of Convertible Preferred Stock and Stockholders' Equity (Deficit) (Parenthetical) $ in Thousands	12 Months Ended
	Mar. 31, 2015 USD ($)
Issuance of common stock upon initial public offering, offering costs	$ 3,069
Series F Convertible Preferred Stock [Member] | Convertible Preferred Stock [Member]
Issuance of convertible preferred stock, issuance cost	$ 2,757