CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current Assets:
Cash and cash equivalents	$ 844	$ 485
Short-term investment securities	28,103	38,477
Accounts receivable, net	999	867
Inventory, net	2,769	2,266
Prepaid expenses and other assets	3,580	648
Total current assets	36,295	42,743
Property, plant and equipment:
Machinery and equipment, net	2,849	3,120
Operating leases right-of-use assets, net	651	602
Total property, plant and equipment	3,500	3,722
Other assets:
Intangible assets, net	8,239	8,494
Investments	7,372	8,403
Convertible note	5,732	5,589
Total other assets	21,343	22,486
Total assets	61,138	68,951
Current liabilities:
Notes payable	2,247	581
Operating lease obligations	333	220
Accounts payable	1,019	1,997
Accrued expenses	2,235	2,619
Accrued severance, current	487	359
Deferred income	0	5
Total current liabilities	6,321	5,781
Long-term liabilities:
Notes payable	292	292
Operating lease obligations	318	382
Severance obligations	342	446
Total long-term liabilities	952	1,120
Commitments and contingencies (Note 11)
Shareholders' equity
Common stock value	1	1
Capital in excess of par value	188,591	187,735
Accumulated other comprehensive (loss) income	52	7
Accumulated deficit	(134,779)	(125,693)
Total shareholders' equity	53,865	62,050
Total liabilities and shareholders' equity	$ 61,138	$ 68,951