CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Apr. 30, 2017	Apr. 30, 2016
Current assets:
Cash and cash equivalents	$ 79,904	$ 124,287
Short-term investments	119,971	103,404
Accounts receivable, net of allowance for doubtful accounts of $291 at April 30, 2017 and $262 at April 30, 2016	74,361	56,045
Unbilled receivables and retentions	14,120	18,899
Inventories, net	60,076	37,486
Prepaid expenses and other current assets	5,653	4,150
Total current assets	354,085	344,271
Long-term investments	42,096	33,859
Property and equipment, net	19,220	16,762
Deferred income taxes	15,089	15,016
Other assets	2,010	750
Total assets	432,500	410,658
Current liabilities:
Accounts payable	20,283	17,712
Wages and related accruals	12,966	13,973
Income taxes payable	1,418	943
Customer advances	3,317	2,544
Other current liabilities	10,079	11,173
Total current liabilities	48,063	46,345
Deferred rent	1,719	1,714
Capital lease obligations - net of current portion	161	449
Other non-current liabilities	184	184
Deferred tax liability	116
Liability for uncertain tax positions	64	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—23,630,419 shares at April 30, 2017 and 23,359,925 at April 30, 2016	2	2
Additional paid-in capital	162,150	154,274
Accumulated other comprehensive loss	(127)	(201)
Retained earnings	219,929	207,450
Total AeroVironment stockholders' equity	381,954	361,525
Noncontrolling interests	239
Total equity	382,193	361,525
Total liabilities and stockholders' equity	$ 432,500	$ 410,658