Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 44,388	$ 13,526
Accounts receivable	227	3,619
Prepaid expenses and other current assets	1,111	453
Total current assets	45,726	17,598
Property and equipment, net	345	210
Right-of-use assets, net	1,755	1,990
Intangible assets, net	16,227	17,093
Other long-term assets	137	141
Total assets	64,190	37,032
Current liabilities:
Accounts payable	1,166	852
Current portion of operating lease liability	804	841
Liability related to sale of future royalties, current portion	3,150	2,916
Other accrued liabilities	6,378	4,565
Total current liabilities	11,498	9,174
Operating lease liability, net of current portion	1,120	1,472
Liability related to sale of future royalties, net of current portion	11,319	13,416
Other long-term liabilities	18	18
Total liabilities	23,955	24,080
Commitments and contingencies (Note 9)
Stockholders’ equity:
Preferred stock: $0.0001 par value; 5,000,000 shares authorized; none issued and outstanding as of June 30, 2020 and December 31, 2019
Common stock: $0.0001 par value; 150,000,000 shares authorized; 96,140,661 and 48,254,994 shares issued and outstanding as of June 30, 2020 and December 31, 2019, respectively	10	5
Additional paid-in capital	167,160	129,608
Accumulated deficit	(126,935)	(116,661)
Total stockholders’ equity	40,235	12,952
Total liabilities and stockholders’ equity	$ 64,190	$ 37,032