Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 24,225	$ 15,313
Trade accounts receivable, net of allowance for doubtful accounts of $255 in 2020 and $136 in 2019	6,658	9,819
Inventory, net	3,348	2,611
Prepaid expenses and other current assets	1,452	1,453
Total current assets	35,683	29,196
Property and equipment, net of accumulated depreciation of $6,652 in 2020 and $6,510 in 2019	590	551
Operating lease assets	2,131	2,406
Other assets	110	50
Intangible assets, net of accumulated amortization of $8,338 in 2020 and $8,186 in 2019	1,037	1,183
Goodwill	8,362	8,362
Total assets	47,913	41,748
Current liabilities:
Accounts payable	1,421	1,990
Accrued and other expenses	5,085	6,590
Notes payable - current portion		4,250
Lease payable - current portion	813	758
Deferred revenue	5,466	5,248
Total current liabilities	12,785	18,836
Lease payable, long-term portion	1,497	1,837
Notes payable, long-term portion	6,937	2,003
Convertible debentures payable to non-related parties, at fair value		12,409
Convertible debentures payable to related parties, at fair value		1,233
Deferred revenue, long-term portion	198	356
Deferred tax	4	3
Total liabilities	21,421	36,677
Commitments and Contingencies (Note 7)
Stockholders' equity:
Preferred stock, $0.01 par value: authorized 1,000,000 shares; none issued.
Common stock, $0.01 par value: authorized 30,000,000 shares; issued 23,060,272 as of June 30, 2020 and 19,546,151 as of December 31, 2019. Outstanding 22,874,441 as of June 30, 2020 and 19,360,320 as of December 31, 2019.	231	195
Additional paid-in capital	266,211	230,615
Accumulated deficit	(238,535)	(224,324)
Treasury stock at cost, 185,831 shares in 2020 and 2019	(1,415)	(1,415)
Total stockholders' equity	26,492	5,071
Total liabilities and stockholders' equity	$ 47,913	$ 41,748