Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 74,394	$ 45,302
Short-term investments	0	9,285
Accounts receivable, net	2,683	2,836
Inventory	3,907	4,603
Prepaid expenses and other assets	2,241	2,308
Total current assets	83,225	64,334
Property and equipment, net	626	677
Intangible assets, net	2,607	2,911
Total assets	86,458	67,922
Current liabilities:
Accounts payable	652	3,171
Accrued expenses and other current liabilities	5,953	3,542
Total current liabilities	6,605	6,713
Long‑term debt with related party	30,827	30,243
Other long‑term liabilities		4
Total liabilities	37,432	36,960
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; 14,437,289 and 11,406,976 shares issued and 14,437,107 and 11,406,221 shares outstanding at December 31, 2020 and December 31, 2019, respectively	14	11
Additional paid-in capital	245,736	198,829
Accumulated other comprehensive loss	(71)	(19)
Accumulated deficit	(196,653)	(167,859)
Total stockholders’ equity	49,026	30,962
Total liabilities and stockholders’ equity	$ 86,458	$ 67,922