Stockholders' Equity (Details) - USD ($)		3 Months Ended				9 Months Ended
	Sep. 25, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Class of Stock [Line Items]
Beginning balance, value		$ 6,194,939	$ 7,459,680	$ 9,002,192		$ 9,002,192
Beginning balance, shares				48,519,313		48,519,313
Issuance of common stock upon exercise of employee and director options, value		18,763
Issuance of common stock under employee stock purchase plan, value		17,881	16,496	$ 1,950
Issuance of common stock under definitive stock purchase agreement, value	$ 5,100,000	5,099,898
Issuance of common stock under definitive stock purchase agreement, shares	5,347,300
Common stock used for tax withholdings, value		(12,380)
Compensation expense from employee and director stock option and common stock grants		141,343	66,984	61,564
Net loss		(543,401)	(1,348,221)	(1,606,026)	$ (2,368,245)	$ (3,497,648)	$ (5,253,193)
Ending balance, value		$ 10,917,043	6,194,939	7,459,680		$ 10,917,043
Ending balance, shares		54,035,328				54,035,328
Common Stock [Member]
Class of Stock [Line Items]
Beginning balance, value		$ 485,665	$ 485,231	$ 485,193		$ 485,193
Beginning balance, shares		48,566,548	48,523,136	48,519,313		48,519,313
Issuance of common stock upon exercise of employee and director options, value		$ 221
Issuance of common stock upon exercise of employee and director options, shares		22,105
Issuance of common stock under employee stock purchase plan, value		$ 458	$ 434	$ 38
Issuance of common stock under employee stock purchase plan, shares		45,849	43,412	3,823
Issuance of common stock under stock bonus plan, value		$ 680
Issuance of common stock under stock bonus plan, shares		68,022
Issuance of common stock under definitive stock purchase agreement, value		$ 53,473
Issuance of common stock under definitive stock purchase agreement, shares		5,347,300
Common stock used for tax withholdings, value		$ (144)
Common stock used for tax withholdings, shares		(14,496)
Ending balance, value		$ 540,353	$ 485,665	$ 485,231		$ 540,353
Ending balance, shares		54,035,328	48,566,548	48,523,136		54,035,328
Additional Paid-in Capital [Member]
Class of Stock [Line Items]
Beginning balance, value		$ 128,556,455	$ 128,473,409	$ 128,409,933		$ 128,409,933
Issuance of common stock upon exercise of employee and director options, value		18,542
Issuance of common stock under employee stock purchase plan, value		17,423	16,062	1,912
Issuance of common stock under stock bonus plan, value		(680)
Issuance of common stock under definitive stock purchase agreement, value		5,046,425
Common stock used for tax withholdings, value		(12,236)
Compensation expense from employee and director stock option and common stock grants		141,343	66,984	61,564
Ending balance, value		133,767,272	128,556,455	128,473,409		133,767,272
Accumulated Deficit [Member]
Class of Stock [Line Items]
Beginning balance, value		(122,847,181)	(121,498,960)	(119,892,934)		(119,892,934)
Net loss		(543,401)	(1,348,221)	(1,606,026)
Ending balance, value		$ (123,390,582)	$ (122,847,181)	$ (121,498,960)		$ (123,390,582)