2004 Plan Outstanding Options Rollforward (Details) - USD ($)	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Shares
Balance at January 1	2,392,786	2,374,124
Granted	37,000	551,256
Exercised	(100,239)	(24,494)
Canceled	(334,741)	(508,100)
Balance at December 31	1,994,806	2,392,786
Exercisable	1,602,695	1,714,299
Unvested	392,111	683,589
Weighted Average Exercise Price
Balance at January 1	$ 2.40	$ 2.54
Granted	1.08	2.20
Exercised	1.68	0.95
Canceled	2.84	2.92
Balance at December 31	2.42	2.40
Exercisable	2.34	2.34
Unvested	$ 2.31	$ 2.50
Outstanding, Remaining contractual term	5 years 6 months	5 years 6 months 29 days
Outstanding, Intrinsic value	$ 690,769	$ 193,170
Exercisable, Remaining contractual term	4 years 9 months	4 years 2 months 1 day
Exercisable, Intrinsic value	$ 603,382	$ 193,170
Unvested, Remaining contractual term	4 years 9 months	9 years 29 days
Unvested, Intrinsic value	$ 87,387

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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Period Type:	instant

- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.