Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 60,292	$ 74,394
Accounts receivable, net	3,545	2,683
Inventory	4,503	3,907
Prepaid expenses and other assets	2,395	2,241
Total current assets	70,735	83,225
Property and equipment, net	609	626
Intangible assets, net	2,455	2,607
Total assets	73,799	86,458
Current liabilities:
Accounts payable	1,277	652
Accrued expenses and other current liabilities	6,017	5,953
Total current liabilities	7,294	6,605
Long-term debt with related party	31,145	30,827
Other long-term liabilities	395
Total liabilities	38,834	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; 14,471,874 and 14,437,289 shares issued and 14,471,774 and 14,437,107 shares outstanding at June 30, 2021 and December 31, 2020, respectively	14	14
Additional paid-in capital	248,076	245,736
Accumulated other comprehensive loss	(81)	(71)
Accumulated deficit	(213,044)	(196,653)
Total stockholders' equity	34,965	49,026
Total liabilities and stockholders' equity	$ 73,799	$ 86,458