Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2019	Jun. 30, 2018
Current assets
Cash and cash equivalents	$ 1,588	$ 552
Short-term investments		3,551
Accounts receivable	3	12
Inventory:
Raw materials, net	150	7
Work-in-process	181
Income tax receivable	429
Prepaid expenses and other current assets	371	154
Total current assets	2,722	4,276
Property and equipment, net	469	733
Long-term investments		50
Long-term tax receivable	429
Other assets	72	81
Total assets	3,692	5,140
Current liabilities
Accounts payable	160	112
Payroll related accruals	319	412
Accrued expenses and other liabilities	357	434
Income tax payable	2	2
Total current liabilities	838	960
Other liabilities	146	188
Total liabilities	984	1,148
Commitments and contingencies (Note 13)
Stockholders’ equity
Common stock, $0.001 par value, 15,000,000 shares authorized; 6,184,698 and 4,496,873 shares issued at June 30, 2019 and 2018, respectively; 5,775,171 and 4,097,346 shares outstanding at June 30, 2019 and 2018, respectively	190,571	190,570
Treasury stock, 399,916 and 399,527 shares at cost at June 30, 2019 and 2018, respectively	(4,129)	(4,128)
Additional paid-in capital	7,964	1,745
Accumulated deficit	(191,698)	(184,164)
Accumulated other comprehensive loss		(31)
Total stockholders’ equity	2,708	3,992
Total liabilities and stockholders’ equity	3,692	5,140
Convertible Preferred Stock
Stockholders’ equity
Convertible preferred stock, $0.001 par value, 2,500,000 shares authorized; 280,898 and no shares of Series C and 280,898 and no shares of Series D issued and outstanding at June 30, 2019 and 2018, respectively