Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2017	Jul. 31, 2016
Operating activities:
Net loss	$ (2,316)	$ (5,105)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization expense	3,487	3,578
Stock-based expense	4,822	3,944
Bad debt expense (recovery)	79	(179)
Amortization of deferred financing costs	59	59
Other non-cash expense	(46)	(39)
Changes in operating assets and liabilities:
Accounts receivable	(5,227)	1,749
Prepaid expenses and other current assets	804	(507)
Other non-current assets	(87)	869
Accounts payable	(461)	(2,616)
Accrued expenses and other current liabilities	(3,805)	(4,442)
Deferred revenue	2,979	2,974
Other liabilities, long-term	(16)	(156)
Net cash provided by operating activities	272	129
Investing activities:
Purchases of property, equipment and capitalized internal-use software development costs	(2,332)	(2,760)
Purchases of short-term investments	(17,054)	(12,691)
Proceeds from maturities of short-term investments	18,214	15,010
Net cash used in investing activities	(1,172)	(441)
Financing activities:
Proceeds from employee stock compensation plans	113	395
Payments on revolving line of credit	5,000	0
Net cash provided by (used in) financing activities	(4,887)	395
Effect of exchange rate fluctuations on cash and cash equivalents	309	(538)
Net change in cash and cash equivalents	(5,478)	(455)
Cash and cash equivalents at beginning of period	52,494	43,963
Cash and cash equivalents at end of period	47,016	43,508
Supplemental disclosure of non-cash investing and financing activities:
Purchase of fixed assets recorded in accounts payable	402	83
Purchase of leasehold improvements funded by tenant improvement allowance	925	0
Capitalized stock-based compensation	$ 137	$ 122