Condensed Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 50,427	$ 55,358
Short-term investments	138,640	158,316
Accounts receivable, net	19,956	18,007
Inventories	17,182	19,293
Prepaid expenses and other current assets	4,049	3,924
Total current assets	230,254	254,898
Long-term investments	15,285
Property and equipment, net	8,897	9,372
Restricted cash	155	155
Other non-current assets	4,996	5,260
Total assets	259,587	269,685
Current liabilities:
Accounts payable	5,272	2,523
Accrued liabilities	15,598	21,965
Total current liabilities	20,870	24,488
Long-term debt	74,848	74,596
Other liabilities	6,256	6,726
Total liabilities	101,974	105,810
Commitments and contingencies (Note 7)
Stockholders' equity:
Preferred stock, $0.001 par value Shares authorized: 5,000,000 at March 31, 2023 and December 31, 2022 Shares issued and outstanding: none at March 31, 2023 and December 31, 2022
Common stock, $0.001 par value Shares authorized: 100,000,000 at March 31, 2023 and December 31, 2022 Shares issued and outstanding: 38,708,441 and 38,355,972 at March 31, 2023 and December 31, 2022, respectively	39	38
Additional paid-in capital	517,663	507,715
Accumulated other comprehensive income (loss)	83	(166)
Accumulated deficit	(360,172)	(343,712)
Total stockholders’ equity	157,613	163,875
Total liabilities and stockholders’ equity	$ 259,587	$ 269,685