CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Current assets
Cash and cash equivalents	$ 165,521	$ 193,725
Accounts receivable, net	283	248
Inventory	1,952	1,985
Prepaid expenses	4,506	3,067
Other current assets	5,006	3,843
Total current assets	177,268	202,868
Property and equipment, net	1,004	1,084
Operating lease right-of-use assets	906	976
Other assets	925	925
Total assets	180,103	205,853
Current liabilities
Accounts payable	7,742	10,228
Accrued expenses	17,065	18,669
Due to related parties	380	422
Accrued interest	3,088	3,175
Other current liabilities	484	404
Total current liabilities	28,759	32,898
Long-term portion of operating lease liabilities	703	786
Derivative liabilities	2,574	2,343
Long-term debt	95,062	93,051
Total liabilities	127,098	129,078
Commitments and contingencies (Note 15)
Stockholders' equity
Preferred stock, $0.001 par value, 10,000 shares authorized; no shares issued and outstanding as of March 31, 2023 and December 31, 2022
Common stock, $0.001 par value, 100,000 shares authorized as of March 31, 2023 and December 31, 2022; 29,100 and 28,147 shares issued and outstanding as of March 31, 2023 and December 31, 2022, respectively	29	28
Additional paid-in-capital	517,317	488,292
Accumulated deficit	(464,341)	(411,545)
Total stockholders' equity	53,005	76,775
Total liabilities and stockholders' equity	$ 180,103	$ 205,853

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).