Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 5,585	$ 5,358
Accounts receivable, net of allowance for doubtful accounts of $2 and $9 at December 31, 2019 and December 31, 2018	147	274
Inventory	4	141
Prepaid expenses and other current assets	642	445
Total current assets	6,378	6,218
Property and equipment, net	181	145
Operating lease right-of-use asset, net	1,065
Other assets	54	54
Total assets	7,678	6,417
Current liabilities:
Accounts payable	914	743
Accrued expenses and other current liabilities	2,561	1,805
Operating lease liability - current	528
Total current liabilities	4,003	2,548
Operating lease liability - noncurrent	614
Deferred revenue	691
Deferred rent		77
Total liabilities	5,308	2,625
Stockholders’ equity:
Preferred stock, $0.001 par value, 25,000,000 shares authorized as of December 31, 2019 and December 31, 2018; no shares issued and outstanding as of December 31, 2019 and December 31, 2018
Common stock, $0.001 par value, 100,000,000 shares authorized as of December 31, 2019 and December 31, 2018; 6,825,183 and 4,845,697 shares issued and outstanding as of December 31, 2019 and December 31, 2018	7	5
Additional paid-in capital	103,433	90,148
Accumulated deficit	(101,070)	(86,361)
Total stockholders’ equity	2,370	3,792
Total liabilities and stockholders’ equity	$ 7,678	$ 6,417