Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 215,077	$ 233,408
Trade accounts receivable	19,760	12,939
Inventory	12,572	11,047
Prepaid expenses and other current assets	8,115	8,175
Total current assets	255,524	265,569
Restricted cash	270	270
Property and equipment, net	20,839	14,544
Operating lease right-of-use assets	15,724	16,718
Other assets	3,357	2,557
Total assets	295,714	299,658
Current liabilities:
Trade accounts payable	8,727	3,491
Accrued expenses and other current liabilities	10,501	8,401
Current portion of notes payable	0	11,594
Deferred revenue	8,258	5,482
Total current liabilities	27,486	28,968
Notes payable, net of current portion	19,673	8,301
Deferred revenue, net of current portion	1,875	1,709
Operating lease liability, noncurrent	14,841	15,899
Total liabilities	63,875	54,877
Commitments and contingencies (Note 13)
Stockholders’ equity:
Convertible preferred stock, $0.00005 par value. Authorized 10,000,000 shares at June 30, 2021 and December 31, 2020, respectively; no shares issued and outstanding at June 30, 2021 and December 31, 2020	0	0
Common stock, $0.00005 par value. Authorized 300,000,000 shares at June 30, 2021 and December 31, 2020; issued and outstanding 67,043,537 and 64,486,246 shares at June 30, 2021 and December 31, 2020, respectively	4	3
Additional paid-in capital	457,308	436,662
Accumulated deficit	(225,473)	(191,884)
Total stockholders’ equity	231,839	244,781
Total liabilities and stockholders’ equity	$ 295,714	$ 299,658

Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due within one year (or the operating cycle, if longer), including liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received, taxes, interest, rent and utilities, accrued salaries and bonuses, payroll taxes and fringe benefits.

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- Definition

Carrying value as of the balance sheet date of obligations incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).