Summary of Significant Accounting Policies - EPS (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Numerator:
Net loss	$ (970)	$ (3,600)	$ (3,910)	$ (7,252)
Denominator:
Weighted-average common shares outstanding (in shares)	28,171,899	27,598,492	28,029,526	27,540,378
Weighted-average common shares and common share equivalents outstanding (in shares)	28,171,899	27,598,492	28,029,526	27,540,378
Net income (loss) per common share:
Basic net loss per common share (in dollars per share)	$ (0.03)	$ (0.13)	$ (0.14)	$ (0.26)
Diluted net loss per common share (in dollars per share)	$ (0.03)	$ (0.13)	$ (0.14)	$ (0.26)