CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 28,570,015	$ 29,209,821
Marketable securities	19,337,124	10,845,195
Accounts receivable, less reserve for doubtful accounts of $10,000	6,912,751	4,158,758
Royalties and other receivables	3,845,715	9,130,515
Inventories, net	10,264,232	11,143,695
Deferred tax asset, net	416,580	416,580
Prepaid expenses and other current assets	1,352,523	1,304,887
Total current assets	70,698,940	66,209,451
Property, plant and equipment, at cost:
Leasehold improvements	5,246,962	5,200,271
Equipment	12,963,808	12,802,978
Furniture and fixtures	1,978,138	1,937,238
Construction in progress	383,353	338,814
Total property, plant and equipment, at cost	20,572,261	20,279,301
Less: Accumulated depreciation	(10,879,103)	(10,326,840)
Property, plant and equipment, net	9,693,158	9,952,461
Long-term deferred tax asset, net	2,669,762	2,557,384
Long-term marketable securities	6,148,089	9,914,855
Intangible assets, net	6,910,819	7,182,012
Goodwill	994,000	994,000
Restricted cash	200,000	200,000
Total assets	97,314,768	97,010,163
Current liabilities:
Accounts payable	1,900,861	2,454,238
Accrued liabilities	6,993,805	8,297,990
Total current liabilities	8,894,666	10,752,228
Other long-term liabilities	1,009,068	2,133,339
Commitments and contingencies
Stockholders' equity:
Preferred stock, $.01 par value, 5,000,000 shares authorized, no shares issued or outstanding
Common stock, $.01 par value, 40,000,000 shares authorized, 31,425,368 shares at March 31, 2013 and 31,195,041 shares at December 31, 2012 issued and outstanding	314,254	311,950
Additional paid-in capital	188,255,742	187,051,253
Accumulated other comprehensive income	1,653,379	1,911,970
Accumulated deficit	(102,812,341)	(105,150,577)
Total stockholders' equity	87,411,034	84,124,596
Total liabilities and stockholders' equity	$ 97,314,768	$ 97,010,163