Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash flows from operating activities:
Net loss	$ (18,071)	$ (15,119)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	4,222	3,301
Stock-based compensation expense	7,338	4,659
Other	293	418
Changes in operating assets and liabilities:
Accounts receivable	3,695	(4,721)
Prepaid expenses and other assets	(3,567)	(384)
Accounts payable	996	(387)
Accrued compensation and benefits and other liabilities	(324)	827
Deferred revenue	7,505	9,332
Deferred rent	1,319	(70)
Net cash provided by (used in) operating activities	3,406	(2,144)
Cash flows from investing activities:
Purchases of property and equipment	(1,527)	(2,671)
Purchases of short-term investments	(24,875)	(43,146)
Proceeds from sale and maturity of short-term investments	35,774	13,625
Capitalized software development costs	(712)	(2,209)
Net cash provided by (used in) investing activities	8,660	(34,401)
Cash flows from financing activities:
Proceeds from issuance of common stock from employee stock options	3,675	1,516
Net cash provided by financing activities	3,675	1,516
Net increase (decrease) in cash and cash equivalents	15,741	(35,029)
Cash and cash equivalents, beginning of period	65,914	105,257
Cash and cash equivalents, end of period	81,655	70,228
Supplemental disclosure of cash flow information:
Cash paid for interest and income taxes	16
Noncash investing and financing activities:
Property and equipment purchased but not paid yet	$ 2,663	$ 1,028