Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 14,599	$ 14,487
Accounts receivable, net	7,607	5,799
Inventory	5,721	7,863
Prepaid expenses and other current assets	270	539
Total current assets	28,197	28,688
Property and equipment, net	1,946	3,479
Right-of-use assets	2,313	3,132
Other assets	73	73
Total assets	32,529	35,372
Current liabilities:
Accounts payable	2,224	2,873
Accrued liabilities	2,232	2,727
Current portion of long-term debt	4,242	670
Operating lease liabilities	1,508	1,582
Other liabilities	31	42
Total current liabilities	10,237	7,894
Long-term debt, net of current portion	3,748	7,149
Operating lease liabilities, net of current portion	903	1,840
Long-term income tax liability	229
Total liabilities	15,117	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 December 31, 2020 and 2019
Common stock, $0.0001 par value per share; 100,000,000 shares authorized; 19,031,556 and 18,081,753 shares issued and outstanding as of December 31, 2020 and 2019	2	2
Additional paid-in capital	174,584	167,149
Accumulated deficit	(157,174)	(148,662)
Total stockholders' equity	17,412	18,489
Total liabilities and stockholders' equity	$ 32,529	$ 35,372