Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2016	Apr. 30, 2015	Apr. 30, 2014
Operating activities:
Net loss applicable to common stockholders	$ (25,339)	$ (34,421)	$ (63,166)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization expense	14,062	12,453	15,068
Impairment of acquired intangible assets	0	0	2,500
Loss on disposal of discontinued operations, net of tax	0	1,537	9,192
Loss on sub-lease	546	0	0
Stock-based expense	14,761	12,201	13,827
Revaluation of contingent consideration	0	0	(3,270)
Bad debt expense	93	3,155	1,902
Excess tax benefit related to stock-based expense	0	(6)	(216)
Amortization of deferred financing costs	235	98	0
Other non-cash expense	73	151	480
Changes in operating assets and liabilities:
Accounts receivable	9,842	(13,589)	(12,081)
Prepaid expenses and other current assets	187	(165)	(1,551)
Other non-current assets	(1,531)	(177)	(1,603)
Accounts payable	2,401	(297)	(3,095)
Accrued expenses and other current liabilities	(4,428)	(1,165)	(2,623)
Deferred revenue	2,286	6,258	2,040
Other liabilities, long-term	6,204	(2,599)	(1,512)
Net cash provided by (used in) operating activities	19,392	(16,566)	(44,108)
Investing activities:
Acquisitions, net of cash acquired, and purchase of intangible asset	0	0	(9,616)
Proceeds from sale of discontinued operations	4,501	25,500	0
Purchases of property, equipment and capitalized internal-use software development costs	(23,657)	(11,438)	(10,020)
Decrease in restricted cash	0	500	0
Purchases of short-term investments	(61,834)	(82,770)	(60,092)
Proceeds from maturities of short-term investments	63,650	65,681	58,478
Proceeds from sale of short-term investments	0	5,012	31,098
Net cash provided by (used in) investing activities	(17,340)	2,485	9,848
Financing activities:
Proceeds from employee stock compensation plans	3,027	7,545	13,499
Proceeds from revolving line of credit	0	57,000	27,000
Payments on revolving line of credit	(15,000)	(27,000)	0
Deferred financing costs	0	(706)	0
Excess tax benefit related to stock-based expense	0	6	216
Net cash provided by (used in) financing activities	(11,973)	36,845	40,715
Effect of exchange rate fluctuations on cash and cash equivalents	(157)	(657)	434
Net change in cash and cash equivalents	(10,078)	22,107	6,889
Cash and cash equivalents at beginning of period	54,041	31,934	25,045
Cash and cash equivalents at end of period	43,963	54,041	31,934
Supplemental disclosure of other cash flow information:
Cash paid for income taxes, net of refunds	1,071	902	1,493
Cash paid for interest	2,132	1,418	137
Supplemental disclosure of non-cash investing and financing activities:
Purchase of fixed assets recorded in accounts payable	180	282	0
Asset retirement obligation costs incurred	100	532	0
Capitalized stock-based compensation	$ 813	$ 601	$ 641