Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 13,927	$ 14,487
Accounts receivable, net	8,167	5,799
Inventory	6,173	7,863
Prepaid expenses and other current assets	99	539
Total current assets	28,366	28,688
Property and equipment, net	2,126	3,479
Right-of-use assets	2,652	3,132
Other assets	73	73
Total assets	33,217	35,372
Current liabilities:
Accounts payable	2,806	2,873
Accrued liabilities	1,708	2,727
Current portion of long-term debt	3,614	670
Operating lease liabilities	1,531	1,582
Other liabilities	38	42
Total current liabilities	9,697	7,894
Long-term debt, net of current portion	4,283	7,149
Operating lease liabilities, net of current portion	1,279	1,840
Total liabilities	15,259	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 September 30, 2020 and December 31, 2019
Common stock, $0.0001 par value per share; 100,000,000 shares authorized; 18,970,791 and 18,081,753 shares issued and outstanding as of September 30, 2020 and December 31, 2019	2	2
Additional paid-in capital	173,539	167,149
Accumulated deficit	(155,583)	(148,662)
Total stockholders' equity	17,958	18,489
Total liabilities and stockholders' equity	$ 33,217	$ 35,372