Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Jan. 31, 2017	Jan. 31, 2016
Operating activities:
Net loss	$ (11,967)	$ (18,210)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization expense	10,623	10,487
Stock-based expense	12,172	11,484
Bad debt expense	(243)	(265)
Amortization of deferred financing costs	176	176
Loss on sublease	501	0
Other non-cash expense	(172)	82
Changes in operating assets and liabilities:
Accounts receivable	(11,784)	10,715
Prepaid expenses and other current assets	(815)	(479)
Other non-current assets	862	(968)
Accounts payable	(1,313)	1,797
Accrued expenses and other current liabilities	(5,425)	(5,138)
Deferred revenue	8,447	225
Other liabilities, long-term	(468)	5,039
Net cash provided by operating activities	594	14,945
Investing activities:
Proceeds from sale of discontinued operations	0	4,501
Purchases of property, equipment and capitalized internal-use software development costs	(6,988)	(19,422)
Purchases of short-term investments	(36,895)	(53,467)
Proceeds from maturities of short-term investments	42,140	55,017
Net cash used in investing activities	(1,743)	(13,371)
Financing activities:
Proceeds from employee stock compensation plans	1,297	2,777
Payments on revolving line of credit	5,000	0
Net cash provided by (used in) financing activities	(3,703)	2,777
Effect of exchange rate fluctuations on cash and cash equivalents	(824)	(448)
Net change in cash and cash equivalents	(5,676)	3,903
Cash and cash equivalents at beginning of period	43,963	54,041
Cash and cash equivalents at end of period	38,287	57,944
Supplemental disclosure of non-cash investing and financing activities:
Purchase of fixed assets recorded in accounts payable	0	318
Asset retirement obligation costs incurred	0	100
Capitalized stock-based compensation	$ 365	$ 366