Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 16,258	$ 11,506
Accounts receivable	35	1,796
Prepaid expenses and other current assets	814	1,343
Total current assets	17,107	14,645
Property and equipment, net	1,517	1,066
Right-of-use assets, net	565
Intangible assets, net	17,959	19,413
Other long-term assets	102	103
Total assets	37,250	35,227
Current liabilities:
Accounts payable	610	962
Current portion of secured promissory note payable to Oxford Finance	1,667	1,667
Current portion of operating lease liability	565
Liability related to sale of future royalties, current portion	3,150	3,328
Other accrued liabilities	1,485	1,518
Total current liabilities	7,477	7,475
Operating lease liability, net of current portion	216
Long-term portion	12,519	14,413
Secured promissory note payable to Oxford Finance, net of current portion	1,175	1,944
Other long-term liabilities	18	157
Total liabilities	21,405	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 June 30, 2019 or December 31, 2018
Common Stock: $0.10 par value; 100,000,000 shares authorized; 15,785,735 and 7,141,189 shares issued and outstanding as of June 30, 2019 and December 31, 2018, respectively	1,579	714
Additional paid-in capital	119,258	108,513
Accumulated deficit	(104,992)	(97,989)
Total stockholders’ equity	15,845	11,238
Total liabilities and stockholders’ equity	$ 37,250	$ 35,227