Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 76,500	$ 67,737
Prepaid expenses and other current assets	1,347	475
Total current assets	77,847	68,212
Other assets	90	90
Total assets	77,937	68,302
Current liabilities:
Accounts payable	45,962	15,366
Accrued expenses	18,602	3,175
Deferred revenue	4,145	1,874
Total current liabilities	68,709	20,415
Non-current liabilities:
Deferred revenue	2,054	2,342
Long-term debt	24,818
Total liabilities	95,581	22,757
Stockholders' equity (deficit):
Common stock, $0.001 par value: 225,000,000 shares authorized at September 30, 2021 and December 31, 2020; 60,017,333 and 51,626,508 shares issued and outstanding at September 30, 2021 and December 31, 2020, respectively	60	52
Additional paid-in capital	559,835	419,923
Accumulated deficit	(577,539)	(374,430)
Total stockholders' equity (deficit)	(17,644)	45,545
Total liabilities and stockholders' equity (deficit)	$ 77,937	$ 68,302

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).

Name:	us-gaap_AccountsPayableCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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).