Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Jan. 31, 2016	Jan. 31, 2015
Operating activities:
Net loss applicable to common stockholders	$ (18,210)	$ (25,596)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization expense	10,487	9,169
Loss on disposal of discontinued operations, net of tax	0	1,537
Stock-based expense	11,850	9,689
Bad debt expense	(265)	2,126
Excess tax benefit related to stock-based expense	0	(2)
Amortization of deferred financing costs	176	39
Other non-cash expense	82	145
Changes in operating assets and liabilities:
Accounts receivable	10,715	(18,757)
Prepaid expenses and other current assets	(479)	(1,600)
Other non-current assets	(968)	(112)
Accounts payable	1,797	844
Accrued expenses and other current liabilities	(5,138)	(2,391)
Deferred revenue	225	6,810
Other liabilities, long-term	5,039	(933)
Net cash provided by (used in) operating activities	15,311	(19,032)
Investing activities:
Proceeds from sale of discontinued operations	4,501	25,500
Purchases of property, equipment and capitalized internal-use software development costs	(19,788)	(9,250)
Decrease in restricted cash	0	500
Purchases of short-term investments	(53,467)	(79,136)
Proceeds from maturities of short-term investments	55,017	55,767
Proceeds from sale of short-term investments	0	5,012
Net cash used in investing activities	(13,737)	(1,607)
Financing activities:
Proceeds from employee stock compensation plans	2,777	6,215
Proceeds from revolving line of credit	0	57,000
Payments on revolving line of credit	0	(27,000)
Deferred financing costs	0	(706)
Excess tax benefit related to stock-based expense	0	2
Net cash provided by financing activities	2,777	35,511
Effect of exchange rate fluctuations on cash and cash equivalents	(448)	(1,019)
Net change in cash and cash equivalents	3,903	13,853
Cash and cash equivalents at beginning of period	54,041	31,934
Cash and cash equivalents at end of period	57,944	45,787
Supplemental disclosure of other cash flow information:
Cash paid for income taxes, net of refunds	662	832
Cash paid for interest	1,631	889
Supplemental disclosure of non-cash investing and financing activities:
Purchase of fixed assets recorded in accounts payable	318	0
Asset retirement obligation costs incurred	$ 100	$ 0