Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 127,562	$ 88,628
Short-term investments	111,569	246,589
Accounts receivable, net	46,430	29,932
Inventory	10,268	5,313
Prepaid expenses and other current assets	9,693	7,363
Total current assets	305,522	377,825
Property and equipment, net	55,944	34,247
Operating lease right-of-use assets	84,587	84,714
Goodwill	862	862
Other assets	16,052	14,091
Total assets	462,967	511,739
Current liabilities:
Accounts payable	10,509	4,365
Accrued liabilities	51,486	40,532
Deferred revenue	3,049	930
Debt, current portion	11,667	11,667
Operating lease liabilities, current portion	11,142	8,171
Total current liabilities	87,853	65,665
Debt, noncurrent portion	9,690	21,339
Other noncurrent liabilities	697	1,830
Operating lease liabilities, noncurrent portion	85,212	81,293
Total liabilities	183,452	170,127
Commitments and contingencies (Note 6)
Stockholders’ equity:
Preferred stock, $0.001 par value – 5,000,000 shares authorized at December 31, 2021 and 2020; and none issued and outstanding at December 31, 2021 and 2020, respectively	0	0
Common stock, $0.001 par value – 100,000,000 shares authorized at December 31, 2021 and 2020; 29,493,726 and 29,019,350 shares issued and outstanding at December 31, 2021 and 2020, respectively	27	27
Additional paid-in capital	685,594	646,258
Accumulated other comprehensive income (loss)	(61)	11
Accumulated deficit	(406,045)	(304,684)
Total stockholders’ equity	279,515	341,612
Total liabilities and stockholders’ equity	$ 462,967	$ 511,739