Net Income (Loss) per Share Attributable to Common Stockholders - Summary of Common Stock Equivalents Excluded from Computation of Diluted Net Income (Loss) Per Share (Detail)	3 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Stock options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common stock equivalents excluded from computation of diluted net income (loss) per share	1,890,019	771,573
Convertible preferred stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common stock equivalents excluded from computation of diluted net income (loss) per share		8,514,773
Convertible Preferred Stock Warrants [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common stock equivalents excluded from computation of diluted net income (loss) per share		180,845
Common stock warrants [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common stock equivalents excluded from computation of diluted net income (loss) per share	153,909