Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities:
Net loss	$ (15,119)	$ (10,183)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	3,301	1,561
Stock-based compensation expense	4,659	1,931
Other	418	(44)
Changes in operating assets and liabilities:
Accounts receivable	(4,721)	(2,189)
Prepaid expenses and other assets	(384)	(190)
Accounts payable	(387)	(908)
Accrued compensation and benefits and other liabilities	827	(155)
Deferred revenue	9,332	2,770
Deferred rent	(70)	8
Net cash used in operating activities	(2,144)	(7,399)
Cash flows from investing activities:
Purchases of property and equipment	(2,671)	(2,385)
Down payment for property and equipment		(32)
Increase in restricted cash		(28)
Purchases of short-term investments	(43,146)
Proceeds from sale and maturity of short-term investments	13,625
Capitalized software development costs	(2,209)	(1,946)
Net cash used in investing activities	(34,401)	(4,391)
Cash flows from financing activities:
Proceeds from issuances of preferred stock, net of issuance costs		97,247
Payments of costs related to initial public offering		(1,087)
Proceeds from issuance of common stock	1,516	182
Net cash provided by financing activities	1,516	96,342
Net increase (decrease) in cash and cash equivalents	(35,029)	84,552
Cash and cash equivalents, beginning of period	105,257	19,453
Cash and cash equivalents, end of period	70,228	104,005
Noncash investing and financing activities:
Property and equipment purchased but not paid yet	$ 1,028	1,451
Accrued initial public offering costs		$ 227