Consolidated Balance sheets - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 80,819	$ 14,021
Marketable securities	4,498	1,347
Prepaid expenses and other current assets	2,264	681
Restricted cash		125
Total current assets	87,581	16,174
Property and equipment, net	874	1,017
Operating lease right-of-use assets	23,678	275
Deposits	386	40
Restricted cash	2,066	100
Assets held-for-sale	250
Total assets	114,835	17,606
Current liabilities:
Accounts payable	7,384	1,905
Accrued expenses and other current liabilities	7,851	2,421
Current portion of long-term debt	2,891	0
Operating lease liabilities	4,468	291
Current portion of finance lease obligation	166	343
Deferred revenue	8,104
Total current liabilities	30,864	4,960
Long-term debt, net of discount and current portion	13,237	14,470
Operating lease liabilities, net of current portion	14,479
Finance lease obligation, net of current portion	48	116
Preferred unit warrant liability	0	261
Total liabilities	58,628	19,807
Commitments and contingencies (Note 16)
Stockholders' equity/Members' deficit:
Preferred stock, $0.001 par value; 5,000,000 shares and no shares authorized at December 31, 2020 and 2019, respectively; no shares issued and outstanding as of December 31, 2020 and 2019
Common stock, $0.001 par value; 125,000,000 shares and no shares authorized at December 31, 2020 and 2019, respectively; 10,193,831 shares and no shares issued and outstanding as of December 31, 2020 and 2019, respectively	10
Additional paid-in capital	204,007
Accumulated deficit	(147,810)	(97,020)
Total stockholders' equity/members' deficit	56,207	(91,900)
Total liabilities, preferred units and stockholders' equity/ members' deficit	$ 114,835	17,606
Preferred Units [Member]
Current liabilities:
Preferred units (Class A, B and C), no units and 17,515,738 units authorized at December 31, 2020 and 2019, respectively; no units and 12,391,101 units issued and outstanding at December 31, 2020 and 2019, respectively		89,699
Stockholders' equity/Members' deficit:
Total stockholders' equity/members' deficit		89,699
Common Units [Member]
Stockholders' equity/Members' deficit:
Common units, no units and 15,492,000 units authorized at December 31, 2020 and 2019, respectively; no units and 2,163,099 units issued and outstanding at December 31, 2020 and 2019, respectively		5,120
Total stockholders' equity/members' deficit		$ 5,120

Carrying value as of the balance sheet date of liabilities 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).

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- Definition

Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).