Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 53,636	$ 74,394
Accounts receivable, net	3,573	2,683
Inventory	6,269	3,907
Prepaid expenses and other assets	2,061	2,241
Total current assets	65,539	83,225
Property and equipment, net	891	626
Intangible assets, net	2,379	2,607
Total assets	68,809	86,458
Current liabilities:
Accounts payable	2,334	652
Accrued expenses and other current liabilities	7,043	5,953
Total current liabilities	9,377	6,605
Long-term debt with related party	31,315	30,827
Other long-term liabilities	388
Total liabilities	41,080	37,432
Stockholders' equity:
Preferred stock; $0.001 par value: 10,000,000 shares authorized; no shares issued and outstanding
Common stock; $0.001 par value: 200,000,000 shares authorized; 14,503,582 and 14,437,289 shares issued and 14,503,518 and 14,437,107 shares outstanding at September 30, 2021 and December 31, 2020, respectively	15	14
Additional paid-in capital	249,067	245,736
Accumulated other comprehensive loss	(43)	(71)
Accumulated deficit	(221,310)	(196,653)
Total stockholders' equity	27,729	49,026
Total liabilities and stockholders' equity	$ 68,809	$ 86,458