Stockholders' Equity - Employee Stock Purchase Plan (Details)		12 Months Ended		12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013 1998 Plan Employee Stock Purchase Plan	Aug. 30, 2010 1998 Plan Employee Stock Purchase Plan	Mar. 31, 2014 2012 Plan Employee Stock Purchase Plan	Mar. 31, 2013 2012 Plan Employee Stock Purchase Plan	Aug. 30, 2012 2012 Plan Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance	9,367,000		6,300,000
Additional common stock reserved for future issuance						1,800,000
Percentage of purchase price of common stock equal to fair market value				85.00%
Common stock, shares issued, employee stock purchase plan		400,000		700,000	600,000
Shares available for future issuance				500,000