Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2016	Jul. 31, 2015
Operating activities:
Net loss	$ (5,105)	$ (10,244)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization expense	3,578	3,644
Stock-based expense	3,944	3,935
Bad debt expense (recovery)	(179)	85
Amortization of deferred financing costs	59	59
Other non-cash expense (benefit)	(39)	51
Changes in operating assets and liabilities:
Accounts receivable	1,749	(1,076)
Prepaid expenses and other current assets	(507)	(48)
Other non-current assets	869	(314)
Accounts payable	(2,616)	(808)
Accrued expenses and other current liabilities	(4,442)	(4,162)
Deferred revenue	2,974	2,498
Other liabilities, long-term	(156)	4
Net cash provided by (used in) operating activities	129	(6,376)
Investing activities:
Proceeds from sale of discontinued operations	0	4,501
Purchases of property, equipment and capitalized internal-use software development costs	(2,760)	(2,929)
Purchases of short-term investments	(12,691)	(15,155)
Proceeds from maturities of short-term investments	15,010	18,172
Net cash provided by (used in) investing activities	(441)	4,589
Financing activities:
Proceeds from employee stock compensation plans	395	1,101
Net cash provided by financing activities	395	1,101
Effect of exchange rate fluctuations on cash and cash equivalents	(538)	95
Net change in cash and cash equivalents	(455)	(591)
Cash and cash equivalents at beginning of period	43,963	54,041
Cash and cash equivalents at end of period	43,508	53,450
Supplemental disclosure of other cash flow information:
Cash paid for income taxes, net of refunds	183	335
Cash paid for interest	419	542
Supplemental disclosure of non-cash investing and financing activities:
Purchase of fixed assets recorded in accounts payable	83	413
Capitalized stock-based compensation	$ 122	$ 114