Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Current assets
Cash and cash equivalents	$ 121,947	$ 148,480
Restricted cash	231	231
Short-term marketable securities	40,139	31,561
Accounts receivable, net	7,521	6,562
Inventory	19,212	16,285
Prepaid expenses and other current assets	3,731	4,883
Total current assets	192,781	208,002
Long-term marketable securities	4,684	10,941
Property and equipment, net	4,932	4,814
Goodwill	2,333	2,333
Intangible assets, net	216	277
Right of use assets	6,987	8,075
Other long-term assets	796	731
Total assets	212,729	235,173
Current liabilities
Accounts payable	2,599	1,582
Accrued liabilities	11,734	13,366
Income taxes payable	0	147
Deferred revenue	131	163
Short-term debt	2,921	91
Current lease liabilities	3,061	2,201
Total current liabilities	20,446	17,550
Deferred tax liability	47	37
Long-term lease liabilities	5,415	6,844
Long-term debt	14,460	17,324
Other long-term liabilities	179	179
Total liabilities	40,547	41,934
Commitments and contingencies (Note 8)
Stockholders’ equity
Preferred stock, $0.001 par value, 10,000,000 shares authorized; no shares issued and outstanding as of June 30, 2022 and December 31, 2021	0	0
Common stock, $0.001 par value, 200,000,000 shares authorized as of June 30, 2022 and December 31, 2021; 37,266,030 shares issued and outstanding as of June 30, 2022 and 36,931,762 shares issued and outstanding as of December 31, 2021	37	37
Additional paid-in capital	492,651	482,885
Accumulated other comprehensive income	1,357	1,712
Accumulated deficit	(321,863)	(291,395)
Total stockholders’ equity	172,182	193,239
Total liabilities and stockholders’ equity	$ 212,729	$ 235,173