Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Current Assets:
Cash and cash equivalents	$ 17,096	$ 6,329
Short-term investments, available-for-sale	3,971	64,195
Accounts receivable, net	3,508	2,256
Inventories	7,172	8,284
Prepaid expenses	3,143	3,584
Employee retention tax credit receivable	0	554
Other current assets	1,496	1,671
Total Current Assets	36,386	86,873
Restricted cash	1,642	1,141
Long-term investments, available-for-sale	0	3,865
Inventories, net of current portion	4,043	5,469
Property and equipment, net	8,959	9,542
Intellectual property, net	1,237	1,576
Net deferred tax assets	44	174
Operating lease right-of-use assets, net	5,165	4,950
Other long-term assets	1,610	2,463
Total Assets	59,086	116,053
Current Liabilities:
Accounts payable	4,145	3,348
Accrued employee compensation and benefits	5,390	4,508
Accrued expenses and other current liabilities	1,636	1,293
Operating lease liabilities - current portion	1,036	800
Deferred revenue	421	465
Total Current Liabilities	12,628	10,414
Long-Term Liabilities:
Deferred revenue - less current portion	290	0
Contingent consideration	2,220	1,256
Warrant liabilities	5,888	0
Noncurrent operating lease liabilities	4,646	4,738
Total Liabilities	25,672	16,408
Stockholders' Equity:
Common stock $0.001 par value, 750,000,000 shares authorized at December 31, 2023 and December 31, 2022; 264,921,526 and 236,895,440 shares issued and outstanding at December 31, 2023 and December 31, 2022, respectively	265	237
Preferred stock, $0.01 par value, 25,000,000 shares authorized, no shares issued and outstanding at December 31, 2023 and December 31, 2022	0	0
Additional paid-in capital	973,129	962,731
Accumulated deficit	(939,368)	(860,935)
Accumulated other comprehensive loss	(612)	(2,388)
Total Stockholders' Equity	33,414	99,645
Total Liabilities and Stockholders' Equity	59,086	116,053
Intellectual Property [Member]
Current Assets:
Intellectual property, net	$ 1,237	$ 1,576