Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 41,411	$ 45,302
Short-term investments	5,289	9,285
Accounts receivable, net	2,047	2,836
Inventory	4,803	4,603
Prepaid expenses and other assets	1,763	2,308
Total current assets	55,313	64,334
Property and equipment, net	693	677
Intangible assets, net	2,835	2,911
Total assets	58,841	67,922
Current liabilities:
Accounts payable	1,389	3,171
Accrued expenses	2,834	3,533
Other current liabilities	9	9
Total current liabilities	4,232	6,713
Long‑term debt with related party	30,381	30,243
Other long‑term liabilities	1	4
Total liabilities	34,614	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; 11,407,998 and 11,406,976 shares issued and 11,407,600 and 11,406,221 shares outstanding at March 31, 2020 and December 31, 2019, respectively	11	11
Additional paid-in capital	199,287	198,829
Accumulated other comprehensive income (loss)	8	(19)
Accumulated deficit	(175,079)	(167,859)
Total stockholders’ equity	24,227	30,962
Total liabilities and stockholders’ equity	$ 58,841	$ 67,922