Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2013
Operating activities:
Net loss	$ (34,421)	$ (63,166)	$ (63,752)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization expense	12,453	15,068	10,900
Impairment of acquired intangible assets	0	2,500
Loss on disposal of discontinued operations, net of tax	1,537	9,192
Stock-based expense	12,802	14,468	22,453
Revaluation of contingent consideration		(3,270)	(1,000)
Bad debt expense	3,155	1,902	2,859
Excess tax benefit related to stock-based expense	(6)	(216)	(510)
Amortization of deferred financing costs	98
Other non-cash expense (benefit)	151	480	(5)
Changes in operating assets and liabilities:
Accounts receivables	(13,589)	(12,081)	(10,749)
Prepaid expenses and other current assets	(165)	(1,551)	(1,766)
Other non-current assets	(177)	(1,603)	(432)
Accounts payable	(297)	(3,095)	974
Accrued expenses and other current liabilities	(1,165)	(2,623)	13,283
Deferred revenue	6,258	2,040	8,633
Other liabilities, long-term	(2,599)	(1,512)	(2,699)
Net cash used in operating activities	(15,965)	(43,467)	(21,811)
Investing activities:
Acquisitions, net of cash acquired, and purchase of intangible asset		(9,616)	(60,750)
Proceeds from sale of discontinued operations	25,500
Purchases of property, equipment and capitalized internal-use software development costs	(12,039)	(10,661)	(10,853)
Decrease in restricted cash	500
Purchases of short-term investments	(82,770)	(60,092)	(90,828)
Proceeds from maturities of short-term investments	65,681	58,478	61,310
Proceeds from sale of short-term investments	5,012	31,098	10,037
Net cash provided by (used in) investing activities	1,884	9,207	(91,084)
Financing activities:
Proceeds from follow-on stock offering, net of costs			51,943
Proceeds from employee stock compensation plans	7,545	13,499	11,226
Proceeds from revolving line of credit	57,000	27,000
Payments on revolving line of credit	(27,000)
Deferred financing costs	(706)
Excess tax benefit related to stock-based expense	6	216	510
Net cash provided by financing activities	36,845	40,715	63,679
Effect of exchange rate fluctuations on cash and cash equivalents	(657)	434	(106)
Net change in cash and cash equivalents	22,107	6,889	(49,322)
Cash and cash equivalents at beginning of period	31,934	25,045	74,367
Cash and cash equivalents at end of period	54,041	31,934	25,045
Supplemental disclosure of other cash flow information:
Cash paid for income taxes, net of refunds	902	1,493	440
Cash paid for interest	1,418	$ 137
Supplemental disclosure of non-cash investing and financing activities:
Purchase of fixed assets recorded in accounts payable	282
Asset retirement obligation recorded in accrued expenses and other current liabilities and other liabilities, long-term	$ 532
Purchase of intangible asset recorded in accrued expenses and other current liabilities			705
Issuance of stock for acquisition			$ 125,497