Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 81,467	$ 45,302
Short-term investments	0	9,285
Accounts receivable, net	2,640	2,836
Inventory	4,042	4,603
Prepaid expenses and other assets	867	2,308
Total current assets	89,016	64,334
Property and equipment, net	652	677
Intangible assets, net	2,683	2,911
Total assets	92,351	67,922
Current liabilities:
Accounts payable	976	3,171
Accrued expenses and other current liabilities	4,369	3,542
Total current liabilities	5,345	6,713
Long‑term debt with related party	30,673	30,243
Other long‑term liabilities		4
Total liabilities	36,018	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; 14,432,472 and 11,406,976 shares issued and 14,432,220 and 11,406,221 shares outstanding at September 30, 2020 and December 31, 2019, respectively	14	11
Additional paid-in capital	245,199	198,829
Accumulated other comprehensive loss	(17)	(19)
Accumulated deficit	(188,863)	(167,859)
Total stockholders’ equity	56,333	30,962
Total liabilities and stockholders’ equity	$ 92,351	$ 67,922