Certain Financial Statement Information - Potentially Dilutive Common Shares (Details) - shares shares in Thousands	3 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Certain Financial Statement Information [Line Items]
Dilutive securities excluded from the net loss per share computation	7,187	5,959
Outstanding stock options
Certain Financial Statement Information [Line Items]
Dilutive securities excluded from the net loss per share computation	1,384	1,713
Outstanding RSUs
Certain Financial Statement Information [Line Items]
Dilutive securities excluded from the net loss per share computation	5,420	3,997
ESPP shares
Certain Financial Statement Information [Line Items]
Dilutive securities excluded from the net loss per share computation	383	249