CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 101,545	$ 178,593
Marketable securities	89,239	32,965
Accounts and other receivables, net	19,589	18,354
Prepaid expenses and other current assets	5,920	4,217
Inventory	3,336	3,616
Total current assets	219,629	237,745
Property and equipment, net	545	476
Operating lease right-of-use assets	2,097	2,252
Intangible assets, net	22,134	22,749
Restricted cash	150	150
Total assets	244,555	263,372
Current liabilities:
Accounts payable	7,302	7,385
Accrued expenses	12,329	14,422
Deferred revenue	1,102	1,069
Short-term borrowings	10,475	0
Other current liabilities	763	782
Total current liabilities	31,971	23,658
Long-term debt	29,108	36,562
Deferred revenue - noncurrent	14,302	14,560
Operating lease liabilities - noncurrent	1,697	1,860
Other long-term liabilities	658	2,352
Total liabilities	77,736	78,992
Contingencies (Note 13)
Stockholders' equity:
Preferred stock, $.001 par value, 5,000,000 shares authorized, no shares issued and outstanding	0	0
Common stock, $.001 par value, 300,000,000 shares authorized at March 31, 2022 and December 31, 2021; 34,047,128 and 33,905,826 shares issued and outstanding at March 31, 2022 and December 31, 2021, respectively	34	34
Additional paid-in capital	756,070	752,602
Accumulated deficit	(590,073)	(569,097)
Accumulated other comprehensive income	788	841
Total stockholders' equity	166,819	184,380
Total liabilities and stockholders' equity	$ 244,555	$ 263,372