2004 Plan Outstanding Options Rollforward (Details) - USD ($)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Shares
Balance at January 1	2,374,124	2,247,026
Granted	551,256	281,300
Exercised	(24,494)	(121,981)
Canceled	(508,100)	(32,221)
Balance at December 31	2,392,786	2,374,124
Exercisable	1,714,299
Unvested	683,589
Weighted Average Exercise Price
Balance at January 1	$ 2.54
Granted	2.20	$ 2.86
Exercised	0.95	2.29
Canceled	2.92	3.61
Balance at December 31	2.40	$ 2.54
Exercisable	2.34
Unvested	$ 2.50
Outstanding, Remaining contractual term	5 years 6 months 29 days
Outstanding, Intrinsic value	$ 193,170
Exercisable, Remaining contractual term	4 years 2 months 1 day
Exercisable, Intrinsic value	$ 193,170
Unvested, Remaining contractual term	9 years 29 days
Unvested, Intrinsic value

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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
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.