Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 12,916	$ 14,487
Accounts receivable, net	7,339	5,799
Inventory	8,368	7,863
Prepaid expenses and other current assets	501	539
Total current assets	29,124	28,688
Property and equipment, net	2,908	3,479
Right-of-use assets	2,985	3,132
Other assets	73	73
Total assets	35,090	35,372
Current liabilities:
Accounts payable	2,074	2,873
Accrued liabilities	1,392	2,727
Current portion of long-term debt	1,073	670
Operating lease liabilities	1,546	1,582
Other liabilities	44	42
Total current liabilities	6,129	7,894
Long-term debt, net of current portion	6,893	7,149
Operating lease liabilities, net of current portion	1,656	1,840
Total liabilities	14,678	16,883
Commitments and contingencies
Stockholders' equity:
Preferred stock, $0.0001 par value per share; 5,000,000 shares authorized; no shares issued and outstanding as of June 30, 2020 and December 31, 2019
Common stock, $0.0001 par value per share; 100,000,000 shares authorized; 18,869,775 and 18,081,753 shares issued and outstanding as of June 30, 2020 and December 31, 2019	2	2
Additional paid-in capital	172,098	167,149
Accumulated deficit	(151,688)	(148,662)
Total stockholders' equity	20,412	18,489
Total liabilities and stockholders' equity	$ 35,090	$ 35,372