Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 55,358	$ 110,231
Short-term investments	158,316
Accounts receivable, net of allowances of $3 and $6 at December 31, 2022 and December 31, 2021, respectively	18,007	11,832
Inventories	19,293	17,851
Prepaid expenses and other current assets	3,924	3,412
Total current assets	254,898	143,326
Property and equipment, net	9,372	7,697
Restricted cash	155	232
Other non-current assets	5,260	5,370
Total assets	269,685	156,625
Current liabilities:
Accounts payable	2,523	2,379
Accrued liabilities	21,965	19,802
Short-term debt		3,905
Total current liabilities	24,488	26,086
Long-term debt	74,596	44,786
Other liabilities	6,726	6,513
Total liabilities	105,810	77,385
Commitments and contingencies (Note 7)
Stockholders’ equity):
Preferred stock, $0.001 par value Shares authorized: 5,000,000 at December 31, 2022 and 2021 Shares issued and outstanding: none at December 31, 2022 and 2021
Common stock, $0.001 par value Shares authorized: 100,000,000 at December 31, 2022 and 2021 Shares issued and outstanding: 38,355,972 and 34,980,896 at December 31, 2022 and 2021, respectively	38	35
Additional paid-in capital	507,715	367,907
Accumulated other comprehensive income (loss)	(166)
Accumulated deficit	(343,712)	(288,702)
Total stockholders’ equity	163,875	79,240
Total liabilities and stockholders’ equity	$ 269,685	$ 156,625