CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Current Assets:
Cash and cash equivalents	$ 119,138	$ 50,315
Equity securities	2,931	1,520
Prepaid and other current assets	495	754
Total Current Assets	122,564	52,589
Property, plant and equipment, at cost:
Property, plant and equipment	9,079	9,080
Less accumulated depreciation and depletion	(96)	(95)
Net property, plant and equipment	8,983	8,985
Operating lease right-of-use assets	291	353
Restricted cash		10
Other long-term assets	100
Total Assets	131,938	61,937
Current Liabilities:
Accounts payable	2,968	1,734
Accrued liabilities	2,060	2,369
Operating lease liability - current	151	149
Total Current Liabilities	5,179	4,252
Operating lease liability, net of current	150	214
Total Liabilities	5,329	4,466
Commitments and Contingencies
Stockholders' Equity:
Common stock, 100,000,000 shares authorized, $.001 par value; Issued shares - 33,536,476 and 19,172,020 respectively Outstanding shares - 33,536,315 and 19,171,859 respectively	33	19
Paid-in capital	461,717	383,723
Accumulated deficit	(334,883)	(326,013)
Less: Treasury stock (161 shares), at cost	(258)	(258)
Total Stockholders' Equity	126,609	57,471
Total Liabilities and Stockholders' Equity	$ 131,938	$ 61,937

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).