CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Oct. 31, 2020	Apr. 30, 2020
CURRENT ASSETS:
Cash and cash equivalents	$ 35,664	$ 36,262
Accounts receivable	11,568	8,606
Contract assets	5,343	3,300
Inventory	9,723	10,883
Prepaid expenses	828	712
Total current assets	63,126	59,763
Property and equipment, net	30,232	27,105
Operating lease right-of-use assets	19,408	20,100
Restricted cash	350	350
Other assets	479	302
Total assets	113,595	107,620
CURRENT LIABILITIES:
Accounts payable	5,654	5,926
Accrued payroll and related costs	4,850	3,019
Contract liabilities	31,450	29,120
Current portion of operating lease liabilities	1,326	1,228
Note payable	0	4,379
Other current liabilities	379	808
Total current liabilities	43,659	44,480
Operating lease liabilities, less current portion	20,550	21,244
Total liabilities	64,209	65,724
Commitments and contingencies (Note 8)
STOCKHOLDERS' EQUITY:
Preferred stock, $0.001 par value; 5,000 shares authorized; 1,648 shares issued and outstanding at October 31, 2020 and April 30, 2020, respectively	2	2
Common stock, $0.001 par value; 150,000 shares authorized; 56,722 and 56,483 shares issued and outstanding at October 31, 2020 and April 30, 2020, respectively	57	56
Additional paid-in-capital	613,384	612,909
Accumulated deficit	(564,057)	(571,071)
Total stockholders' equity	49,386	41,896
Total liabilities and stockholders' equity	$ 113,595	$ 107,620