Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 14,558	$ 14,599
Accounts receivable, net	10,629	7,607
Inventory	6,668	5,721
Prepaid expenses and other current assets	337	270
Total current assets	32,192	28,197
Property and equipment, net	951	1,946
Right-of-use assets	1,270	2,313
Other assets	488	73
Total assets	34,901	32,529
Current liabilities:
Accounts payable	2,663	2,224
Accrued liabilities	2,523	2,232
Deferred revenue	1,382
Current portion of long-term debt	3,364	4,242
Operating lease liabilities	1,011	1,508
Other liabilities	36	31
Total current liabilities	10,979	10,237
Long-term debt, net of current portion	2,100	3,748
Operating lease liabilities, net of current portion	268	903
Long-term income tax liability	229	229
Total liabilities	13,576	15,117
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, 2021 and December 31, 2020
Common stock, $0.0001 par value per share; 100,000,000 shares authorized; 19,552,125 and 19,031,556 shares issued and outstanding as of September 30, 2021 and December 31, 2020	2	2
Additional paid-in capital	177,821	174,584
Accumulated deficit	(156,498)	(157,174)
Total stockholders' equity	21,325	17,412
Total liabilities and stockholders' equity	$ 34,901	$ 32,529