Consolidated Balance Sheets - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 1,737,847	$ 1,691,603
Short-term investments		1,523,333
Royalties receivable, net of reserves of $1,051,424 in 2017 and $1,110,020 in 2016	597,441	1,117,146
Prepaid expenses and other current assets	29,697	256,892
Total current assets	2,364,985	4,588,974
Fixed assets, net	482,561	651,655
Deposits and other assets	33,567	33,567
Total assets	2,881,113	5,274,196
Current liabilities:
Accounts payable	58,090	29,932
Accrued expenses and other	254,833	339,338
Deferred revenue	824
Total current liabilities	313,747	369,270
Shareholders' equity:
Common stock, par value $0.0001 per share; authorized 100,000,000 shares, issued and outstanding 24,043,846 2017 and 2016	2,404	2,404
Additional paid-in capital	111,627,789	111,551,490
Accumulated deficit	(109,062,827)	(106,648,968)
Total shareholders' equity	2,567,366	4,904,926
Total liabilities and shareholders' equity	$ 2,881,113	$ 5,274,196

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).

Name:	us-gaap_AccountsPayableCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.