Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Current Assets:
Cash and cash equivalents	$ 6,329	$ 18,129
Short-term investments, available-for-sale	64,195	80,262
Accounts receivable, net	2,256	749
Inventories	8,284	8,634
Prepaid expenses	3,584	3,255
Employee retention tax credit receivable	554	1,311
Other current assets	1,671	957
Total Current Assets	86,873	113,297
Restricted cash	1,141	1,154
Long-term investments, available-for-sale	3,865	37,435
Inventories, net of current portion	5,469	7,074
Property and equipment, net	9,542	10,971
Intellectual property, net	1,576	9,892
Net deferred tax assets	174	288
Operating lease right-of-use assets, net	4,950	5,348
Other long-term assets	2,463	1,014
Total Assets	116,053	186,473
Current Liabilities:
Accounts payable	3,348	3,448
Accrued employee compensation and benefits	4,508	3,559
Accrued expenses and other current liabilities	1,293	1,617
Operating lease liabilities - current portion	800	683
Deferred revenue	465	543
Total Current Liabilities	10,414	9,850
Long-Term Liabilities:
Contingent consideration	1,256	2,371
Noncurrent operating lease liabilities	4,738	5,006
Total Liabilities	16,408	17,227
Commitments and Contingencies (Note 16)
Stockholders' Equity:
Common stock $0.001 par value, 750,000,000 shares authorized at December 31, 2022 and December 31, 2021; 236,895,440 and 235,218,552 shares issued and outstanding at December 31, 2022 and December 31, 2021, respectively	237	235
Preferred stock, $0.01 par value, 25,000,000 shares authorized, no shares issued and outstanding at December 31, 2022 and December 31, 2021	0	0
Additional paid-in capital	962,731	954,649
Accumulated deficit	(860,935)	(785,374)
Accumulated other comprehensive loss	(2,388)	(264)
Total Stockholders' Equity	99,645	169,246
Total Liabilities and Stockholders' Equity	116,053	186,473
Intellectual Property [Member]
Current Assets:
Intellectual property, net	$ 1,576	$ 9,892