Consolidated Balance Sheets - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 4,572,487	$ 1,847,171
Accounts receivable, net	373,858	809,540
Inventory, net	543,747	533,425
Prepaid expenses and other current assets	292,918	311,644
Total current assets	5,783,010	3,501,780
Property and equipment, net	1,221,827	835,537
Goodwill	600,814	600,814
Intangible assets, net	1,085,366	1,353,182
Other noncurrent assets	259,346	328,601
Total assets	8,950,363	6,619,914
Current liabilities
Accounts payable	1,623,751	1,691,712
Accrued compensation and benefits	1,041,573	746,924
Accrued liabilities	902,019	1,160,714
Deferred revenue	15,824	24,442
Short-term notes payable	398,595	1,010,961
Current maturities of long-term capital lease obligation	399,345	154,839
Total current liabilities	4,381,107	4,789,592
Deferred rent	162,919	290,719
Note payable	660,340	0
Warrant liability	67	8,453
Long-term capital lease obligation and other noncurrent liabilities	437,189	130,153
Total liabilities	5,641,622	5,218,917
Commitments (Note 9)
Stockholders' equity
Common stock, $0.01 par value; 50,000,000 shares authorized; 8,645,720 and 2,265,320 shares issued and outstanding at December 31, 2018 and December 31, 2017, respectively	86,457	22,653
Preferred stock, $0.01 par value; 10,000,000 shares authorized; none issued and outstanding at December 31, 2018 and December 31, 2017, respectively	0	0
Additional paid-in capital	165,313,902	150,114,671
Accumulated other comprehensive loss	(13,093)	(25,900)
Accumulated deficit	(162,078,525)	(148,710,427)
Total stockholders’ equity	3,308,741	1,400,997
Total liabilities and stockholders’ equity	$ 8,950,363	$ 6,619,914