CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jan. 28, 2017	Apr. 30, 2016
Current assets:
Cash and cash equivalents	$ 73,278	$ 124,287
Short-term investments	121,095	103,404
Accounts receivable, net of allowance for doubtful accounts of $375 at January 28, 2017 and $262 at April 30, 2016	23,121	56,045
Unbilled receivables and retentions	14,820	18,899
Inventories, net	68,806	37,486
Income tax receivable	2,487
Prepaid expenses and other current assets	5,341	4,150
Total current assets	308,948	344,271
Long-term investments	43,749	33,859
Property and equipment, net	18,410	16,762
Deferred income taxes	15,779	15,016
Other assets	570	750
Total assets	387,456	410,658
Current liabilities:
Accounts payable	13,792	17,712
Wages and related accruals	10,967	13,973
Income taxes payable		943
Customer advances	5,456	2,544
Other current liabilities	7,753	11,173
Total current liabilities	37,968	46,345
Deferred rent	1,769	1,714
Capital lease obligations - net of current portion	218	449
Other non-current liabilities	193	184
Liability for uncertain tax positions	62	441
Commitments and contingencies
Stockholders' equity:
Preferred stock, $0.0001 par value: Authorized shares—10,000,000; none issued or outstanding
Common stock, $0.0001 par value: Authorized shares—100,000,000 Issued and outstanding shares—23,456,561 shares at January 28, 2017 and 23,359,925 at April 30, 2016	2	2
Additional paid-in capital	157,960	154,274
Accumulated other comprehensive loss	(169)	(201)
Retained earnings	189,453	207,450
Total stockholders' equity	347,246	361,525
Total liabilities and stockholders' equity	$ 387,456	$ 410,658