Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current assets
Cash and cash equivalents	$ 910	$ 91
Marketable securities	26,388	857
Prepaid expenses and other assets	46	181
Total current assets	27,344	1,129
Investments	2,323	10,153
Total assets	29,667	11,282
Current liabilities
Accounts payable and accrued expenses	98	68
Accrued salaries and benefits	361	682
Total current liabilities	459	750
Total liabilities	459	750
Stockholders' equity
Preferred Stock
Common stock, $0.0001 par value, 100,000,000 shares authorized; 34,920,222 and 4,825,552 shares issued at September 30, 2020 and December 31, 2019, respectively; 34,920,219 and 4,825,549 shares outstanding at September 30, 2020 and December 31, 2019, respectively	3
Additional paid-in-capital	186,398	155,062
Treasury stock, at cost, 3 shares at September 30, 2020 and December 31, 2019	(264)	(264)
Accumulated deficit	(156,929)	(144,266)
Total stockholders' equity	29,208	10,532
Total liabilities and stockholders' equity	29,667	11,282
Series D Preferred Stock
Stockholders' equity
Preferred Stock
Series D-1 Preferred Stock
Stockholders' equity
Preferred Stock

Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due within one year (or the operating cycle, if longer), including liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received, taxes, interest, rent and utilities, accrued salaries and bonuses, payroll taxes and fringe benefits.

Name:	us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 65
-Paragraph 15
-Subparagraph (g)(2)
-URI http://asc.fasb.org/extlink&oid=121322162&loc=SL121327923-165333

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(30)(a)(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682