Consolidated Balance Sheets (USD $)	Mar. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 6,526,926	$ 7,569,537
Short term investments	1,502,282us-gaap_MarketableSecuritiesCurrent	1,501,554us-gaap_MarketableSecuritiesCurrent
Royalty receivables, net of reserves of $305,171 in 2015 and 2014	1,154,442us-gaap_AccountsReceivableNetCurrent	1,175,218us-gaap_AccountsReceivableNetCurrent
Prepaid expenses and other current assets	78,773	121,252
Total current assets	9,262,423us-gaap_AssetsCurrent	10,367,561us-gaap_AssetsCurrent
Fixed assets, net	827,808us-gaap_PropertyPlantAndEquipmentNet	660,201us-gaap_PropertyPlantAndEquipmentNet
Long-term investments	1,505,179us-gaap_LongTermInvestments	1,503,525us-gaap_LongTermInvestments
Deposits and other assets	33,567us-gaap_OtherAssetsNoncurrent	33,567us-gaap_OtherAssetsNoncurrent
Total assets	11,628,977us-gaap_Assets	12,564,854us-gaap_Assets
Current liabilities:
Accounts payable	148,660us-gaap_AccountsPayableCurrent	159,312us-gaap_AccountsPayableCurrent
Accrued expenses and other	267,966us-gaap_AccruedLiabilitiesCurrent	323,372us-gaap_AccruedLiabilitiesCurrent
Deferred revenue	32,722us-gaap_DeferredRevenueCurrent
Total current liabilities	449,348us-gaap_LiabilitiesCurrent	482,684us-gaap_LiabilitiesCurrent
Shareholders' equity:
Common stock, par value $0.0001 per share; authorized 100,000,000 shares, issued and outstanding 23,975,846 and 23,924,465 shares for 2015 and 2014	2,397us-gaap_CommonStockValue	2,392us-gaap_CommonStockValue
Additional paid-in capital	110,524,311	110,210,480
Accumulated deficit	(99,347,079)	(98,130,702)
Total shareholders' equity	11,179,629us-gaap_StockholdersEquity	12,082,170us-gaap_StockholdersEquity
Total liabilities and shareholders' equity	$ 11,628,977	$ 12,564,854

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19

-Subparagraph a

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(a))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682