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CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Current assets:    
Cash and cash equivalents $ 2,037 $ 1,029
Short-term investment securities 60,284 21,313
Accounts receivable, net 2,137 2,159
Inventory, net 2,313 2,034
Prepaid expenses and other assets 3,943 1,806
Total current assets 70,714 28,341
Property, plant and equipment, net 4,847 2,483
Operating leases right-of-use assets, net 595 247
Intangible assets, net 8,119 8,211
Investments 9,200 6,536
Other assets 3,684 5,876
Total assets 97,159 51,694
Current liabilities:    
Notes payable 2,659 539
Operating lease obligations 174 247
Accounts payable 981 1,116
Accrued expenses 5,072 4,830
Accrued severance, current 212 339
Deferred income 145 272
Total current liabilities 9,243 7,343
Long-term liabilities:    
Operating lease obligations 423 0
Severance obligations 130 241
Total liabilities 9,796 7,584
Commitments and contingencies (Note 11)
Shareholders' equity    
Common stock value 2 1
Capital in excess of par value 241,968 189,439
Accumulated other comprehensive (loss) income 1 74
Accumulated deficit (154,608) (145,404)
Total shareholders' equity 87,363 44,110
Total liabilities and shareholders' equity $ 97,159 $ 51,694