Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current Assets:
Cash and cash equivalents	$ 59,779	$ 16,363
Short-term investments, available-for-sale	57,972	0
Accounts receivable, net	955	1,115
Inventories	11,954	10,034
Prepaid expenses	2,209	3,535
Employee retention tax credit receivable	1,311	0
Other current assets	627	2,966
Total Current Assets	134,807	34,013
Restricted cash	1,153	1,166
Long-term investments, available-for-sale	30,142	0
Inventories, net of current portion	5,963	8,813
Property and equipment, net	9,911	10,342
Intellectual property, net	12,820	22,267
Net deferred tax assets	287	307
Operating lease right-of-use assets, net	4,328	1,164
Other long-term assets	348	186
Total Assets	199,759	78,258
Current Liabilities:
Accounts payable	3,231	1,965
Accrued expenses	4,841	5,615
Operating lease liabilities - current portion	671	686
Deferred revenue	678	789
Notes payable - current portion, net of debt discount	0	1,228
Total Current Liabilities	9,421	10,283
Long-Term Liabilities:
Contingent consideration	4,949	3,936
Noncurrent operating lease liabilities	3,888	628
Notes payable, less current portion	0	1,587
Warrant liabilities	0	255
Total Liabilities	18,258	16,689
Commitments and Contingencies (Note 11)
Stockholders' Equity:
Common stock $0.001 par value, 750,000,000 shares authorized at September 30, 2021 and December 31, 2020; 234,370,083 and 116,231,072 shares issued and outstanding at September 30, 2021 and December 31, 2020, respectively	234	116
Preferred stock, $0.01 par value, 25,000,000 shares authorized, no shares issued and outstanding at September 30, 2021 and December 31, 2020	0	0
Additional paid-in capital	950,242	781,397
Accumulated deficit	(769,493)	(722,912)
Accumulated other comprehensive income	518	2,968
Total Stockholders' Equity	181,501	61,569
Total Liabilities and Stockholders' Equity	199,759	78,258
Intellectual Property [Member]
Current Assets:
Intellectual property, net	$ 12,820	$ 22,267