Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Current Assets:
Cash and cash equivalents	$ 7,782	$ 17,096
Short-term investments, available-for-sale	0	3,971
Accounts receivable, net	406	3,508
Inventories	7,160	7,172
Prepaid expenses	2,729	3,143
Other current assets	1,364	1,496
Total Current Assets	19,441	36,386
Restricted cash	1,517	1,642
Inventories, net of current portion	2,516	4,043
Property and equipment, net	8,034	8,959
Intellectual property, net	1,012	1,237
Net deferred tax assets	34	44
Operating lease right-of-use assets, net	4,688	5,165
Other long-term assets	1,260	1,610
Total Assets	38,502	59,086
Current Liabilities:
Accounts payable	2,057	4,145
Accrued employee compensation and benefits	3,977	5,390
Accrued expenses and other current liabilities	2,611	1,636
Contingent consideration, current	14,400	0
Operating lease liabilities, current	1,070	1,036
Deferred revenue	496	421
Notes payable	15,309	0
Total Current Liabilities	39,920	12,628
Long-Term Liabilities:
Deferred revenue - less current portion	258	290
Contingent consideration	0	2,220
Warrant liabilities	5,597	5,888
Noncurrent operating lease liabilities	4,054	4,646
Total Liabilities	49,829	25,672
Commitments and Contingencies
Stockholders' Equity:
Common stock $0.001 par value, 750,000,000 shares authorized at June 30, 2024 and December 31, 2023; 272,616,330 and 264,921,526 issued and outstanding at June 30, 2024 and December 31, 2023, respectively	273	265
Preferred stock, $0.01 par value, 25,000,000 shares authorized, no shares issued and outstanding at June 30, 2024 and December 31, 2023	0	0
Additional paid-in capital	977,285	973,129
Accumulated deficit	(987,614)	(939,368)
Accumulated other comprehensive loss	(1,271)	(612)
Total Stockholders' Equity	(11,327)	33,414
Total Liabilities and Stockholders' Equity	38,502	59,086
Intellectual Property [Member]
Current Assets:
Intellectual property, net	$ 1,012	$ 1,237