Condensed Consolidated Balance Sheets (USD $)	Mar. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 49,209,621	$ 39,829,653
Marketable securities	21,551,398	21,793,550
Accounts receivable, less reserve for doubtful accounts of $10,000	5,036,909	4,946,132
Royalties and other receivables		6,730,818
Inventories	11,441,317	11,798,638
Deferred tax asset, net	1,984	1,984
Prepaid expenses and other current assets	1,456,208	1,249,824
Total current assets	88,697,437	86,350,599
Property, plant and equipment, at cost:
Leasehold improvements	9,207,709	8,973,615
Equipment	13,939,322	13,684,954
Furniture and fixtures	2,175,604	2,116,017
Construction in progress	35,168	21,647
Total property, plant and equipment, at cost	25,357,803	24,796,233
Less: Accumulated depreciation	(12,911,214)	(12,287,010)
Property, plant and equipment, net	12,446,589	12,509,223
Long-term deferred tax asset, net	176,742	184,848
Long-term marketable securities	10,904,518	12,218,602
Intangible assets, net	5,915,105	6,187,632
Goodwill	994,000	994,000
Restricted cash	200,000	200,000
Total assets	119,334,391	118,644,904
Current liabilities:
Accounts payable	1,483,447	1,721,459
Accrued liabilities	5,638,935	9,579,712
Total current liabilities	7,122,382	11,301,171
Other long-term liabilities	3,360,477	3,457,631
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, 32,040,683 shares at March 31, 2014 and 31,925,741 shares at December 31, 2013 issued and outstanding	320,407	319,257
Additional paid-in capital	191,454,083	190,625,937
Accumulated other comprehensive income	1,857,361	1,998,330
Accumulated deficit	(84,780,319)	(89,057,422)
Total stockholders' equity	108,851,532	103,886,102
Total liabilities and stockholders' equity	$ 119,334,391	$ 118,644,904