Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 65,829	$ 74,394
Accounts receivable, net	2,795	2,683
Inventory	4,688	3,907
Prepaid expenses and other assets	1,892	2,241
Total current assets	75,204	83,225
Property and equipment, net	584	626
Intangible assets, net	2,531	2,607
Total assets	78,319	86,458
Current liabilities:
Accounts payable	965	652
Accrued expenses and other current liabilities	4,673	5,953
Total current liabilities	5,638	6,605
Long-term debt with related party	30,982	30,827
Other long-term liabilities	8
Total liabilities	36,628	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; 14,440,411 and 14,437,289 shares issued and 14,440,275 and 14,437,107 shares outstanding at March 31, 2021 and December 31, 2020, respectively	14	14
Additional paid-in capital	246,548	245,736
Accumulated other comprehensive loss	(82)	(71)
Accumulated deficit	(204,789)	(196,653)
Total stockholders’ equity	41,691	49,026
Total liabilities and stockholders’ equity	$ 78,319	$ 86,458