CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 105,765	$ 95,633
Marketable securities	16,718	48,928
Accounts and other receivables, net	10,422	15,503
Prepaid expenses and other current assets	9,081	9,858
Inventory	4,071	2,886
Total current assets	146,057	172,808
Property and equipment, net	2,609	1,360
Operating lease right-of-use assets	5,777	6,038
Restricted cash	150	150
Total assets	154,593	180,356
Current liabilities:
Accounts payable	9,453	5,919
Accrued expenses	10,485	16,359
Deferred revenue	1,237	1,205
Short-term borrowings	5,295	10,475
Other current liabilities	772	579
Total current liabilities	27,242	34,537
Long-term debt	29,370	29,310
Deferred revenue - noncurrent	13,270	13,557
Operating lease liabilities - noncurrent	5,721	5,984
Other long-term liabilities	600	600
Total liabilities	76,203	83,988
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, 2023 and December 31, 2022; 34,301,926 and 34,082,934 shares issued and outstanding at March 31, 2023 and December 31, 2022, respectively	34	34
Additional paid-in capital	770,028	766,899
Accumulated deficit	(692,515)	(671,351)
Accumulated other comprehensive income	843	786
Total stockholders' equity	78,390	96,368
Total liabilities and stockholders' equity	$ 154,593	$ 180,356