Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 19,558	$ 11,506
Accounts receivable	559	1,796
Prepaid expenses and other current assets	1,137	1,343
Total current assets	21,254	14,645
Property and equipment, net	1,469	1,066
Right-of-use assets, net	2,301
Intangible assets, net	17,526	19,413
Other long-term assets	145	103
Total assets	42,695	35,227
Current liabilities:
Accounts payable	1,049	962
Current portion of secured promissory note payable to Oxford Finance	2,454	1,667
Current portion of operating lease liability	820
Liability related to sale of future royalties, current portion	3,228	3,328
Other accrued liabilities	1,603	1,518
Total current liabilities	9,154	7,475
Operating lease liability, net of current portion	1,694
Long-term portion	12,926	14,413
Secured promissory note payable to Oxford Finance, net of current portion		1,944
Other long-term liabilities	18	157
Total liabilities	23,792	23,989
Commitments and contingencies (Note 9)
Stockholders’ equity:
Preferred Stock: $0.10 par value; 5,000,000 shares authorized; none issued and outstanding as of September 30, 2019 or December 31, 2018
Common Stock: $0.10 par value; 100,000,000 shares authorized; 46,223,594 and 7,141,189 shares issued and outstanding as of September 30, 2019 and December 31, 2018, respectively	4,622	714
Additional paid-in capital	124,533	108,513
Accumulated deficit	(110,252)	(97,989)
Total stockholders’ equity	18,903	11,238
Total liabilities and stockholders’ equity	$ 42,695	$ 35,227