Condensed Consolidated Balance Sheets - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 10,291,532	$ 1,847,171
Accounts receivable, net	591,492	809,540
Inventory, net	509,057	533,425
Prepaid expenses and other current assets	237,997	311,644
Total current assets	11,630,078	3,501,780
Property and equipment, net	828,120	835,537
Goodwill	600,814	600,814
Intangible assets, net	1,286,228	1,353,182
Other noncurrent assets	266,112	328,601
Total assets	14,611,352	6,619,914
Current liabilities
Accounts payable	1,443,857	1,691,712
Accrued compensation and benefits	1,003,418	746,924
Accrued liabilities	1,098,986	1,160,714
Deferred revenue	23,040	24,442
Short-term notes payable	983,131	1,010,961
Current maturities of long-term capital lease obligation	191,755	154,839
Total current liabilities	4,744,187	4,789,592
Deferred rent	261,791	290,719
Warrant liability	287	8,453
Long-term capital lease obligation and other noncurrent liabilities	305,163	130,153
Total liabilities	5,311,428	5,218,917
Commitments (Note 9)
Stockholders' equity
Common stock, $0.01 par value; 50,000,000 shares authorized; 5,289,919 and 2,265,320 shares issued and outstanding at March 31, 2018 and December 31, 2017, respectively	52,899	22,653
Preferred stock, $0.01 par value; 10,000,000 shares authorized; none issued and outstanding at March 31, 2018 and December 31, 2017, respectively	0	0
Additional paid-in capital	161,044,015	150,114,671
Accumulated other comprehensive loss	(38,479)	(25,900)
Accumulated deficit	(151,758,511)	(148,710,427)
Total stockholders’ equity	9,299,924	1,400,997
Total liabilities and stockholders’ equity	$ 14,611,352	$ 6,619,914