Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($)	Jun. 30, 2019	Dec. 31, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 24,000	$ 1,887,000	$ 4,301,000
Restricted cash	254,000	55,000
Prepaid expenses and other current assets	1,622,000	10,000	34,000
Total current assets	1,900,000	1,952,000	4,335,000
Property and equipment, net	6,000	10,000	13,000
Restricted cash			55,000
Right of use asset, net	779,000
Other assets	18,000	18,000	18,000
Total assets	2,703,000	1,980,000	4,421,000
Current liabilities
Accounts payable	1,748,000	491,000	703,000
Accrued liabilities	1,480,000	857,000	1,158,000
Current portion of operating lease liability	346,000
Convertible promissory notes - related party	5,497,000	4,500,000
Current portion of term loan, net of discount	2,390,000	3,812,000	1,711,000
Total current liabilities	11,461,000	9,660,000	3,572,000
Term loan, net of current portion and discount			2,951,000
Operating lease liability, net of current portion	493,000
Warrant liability		140,000	42,000
Commitments and contingencies (Note 7)
Stockholders' deficit
Preferred stock, $0.001 par value; 1,000,000 shares authorized no shares issued or outstanding
Common stock, $0.001 par value; 95,000,000 shares authorized, 5,807,877 shares issued and outstanding at June 30, 2019 (unaudited) 148,000,000 shares authorized, 701,808 shares issued and outstanding at December 31, 2018	6,000	1,000	20,000
Additional paid-in capital	35,160,000	747,000	419,000
Accumulated deficit	(44,417,000)	(37,279,000)	(31,294,000)
Total stockholders' deficit	(9,251,000)	(36,531,000)	(30,855,000)
Total liabilities, redeemable convertible preferred stock and stockholders' deficit	2,703,000	1,980,000	4,421,000
Series A Redeemable Convertible Preferred Stock [Member]
Redeemable convertible preferred stock:
Redeemable convertible preferred stock		12,814,000	12,814,000
Series B Redeemable Convertible Preferred Stock [Member]
Redeemable convertible preferred stock:
Redeemable convertible preferred stock		$ 15,897,000	$ 15,897,000

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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- 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).