Condensed Consolidated Balance Sheets - USD ($)	Mar. 31, 2017	Dec. 31, 2016
Current assets
Cash and cash equivalents	$ 1,670,311	$ 4,117,324
Accounts receivable, net	379,246	542,420
Inventory, net	642,961	692,368
Prepaid expenses and other current assets	267,971	329,646
Total current assets	2,960,489	5,681,758
Property and equipment, net	743,521	800,723
Goodwill	600,814	600,814
Intangible assets, net	1,554,044	1,620,998
Other noncurrent assets	298,081	279,752
Total assets	6,156,949	8,984,045
Current liabilities
Accounts payable	2,017,202	2,232,563
Accrued compensation and benefits	1,019,962	578,480
Accrued liabilities	883,105	1,215,283
Deferred revenue	31,233	37,397
Short-term notes payable	998,958	1,023,815
Current maturities of long-term capital lease obligation	170,297	184,399
Total current liabilities	5,120,757	5,271,937
Deferred rent	374,194	398,084
Long-term capital lease obligation and other noncurrent liabilities	107,940	146,543
Total liabilities	5,602,891	5,816,564
Commitments (Note 8)
Stockholders' equity
Common stock, $0.01 par value; 200,000,000 shares authorized; 27,377,490 and 25,304,270 shares issued and outstanding at March 31, 2017 and December 31, 2016, respectively	273,775	253,042
Preferred stock, $0.01 par value; 10,000,000 shares authorized; none issued and outstanding at March 31, 2017 and December 31, 2016, respectively	0	0
Additional paid-in capital	138,546,915	136,199,382
Accumulated other comprehensive income	2,419	6,176
Accumulated deficit	(138,269,051)	(133,291,119)
Total stockholders’ equity	554,058	3,167,481
Total liabilities and stockholders’ equity	$ 6,156,949	$ 8,984,045