Condensed Consolidated Balance Sheets (USD $)	Jun. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 33,755,718	$ 39,829,653
Marketable securities	16,270,517	21,793,550
Accounts receivable, less reserve for doubtful accounts of $10,000	9,003,874	4,946,132
Royalties and other receivables	376,540	6,730,818
Inventories	12,823,597	11,798,638
Deferred tax asset, net	39,527	1,984
Prepaid expenses and other current assets	1,587,789	1,249,824
Total current assets	73,857,562	86,350,599
Property, plant and equipment, at cost:
Leasehold improvements	9,212,684	8,973,615
Equipment	14,173,467	13,684,954
Furniture and fixtures	2,217,096	2,116,017
Leased systems to customers and demonstration systems	60,505
Construction in progress	302,996	21,647
Total property, plant and equipment, at cost	25,966,748	24,796,233
Less: Accumulated depreciation	(13,416,575)	(12,287,010)
Property, plant and equipment, net	12,550,173	12,509,223
Long-term deferred tax asset, net		184,848
Long-term marketable securities	11,896,949	12,218,602
Intangible assets, net	16,119,764	6,187,632
Goodwill	14,174,045	994,000
Restricted cash	450,000	200,000
Total assets	129,048,493	118,644,904
Current liabilities:
Accounts payable	3,895,722	1,721,459
Accrued liabilities	4,919,679	9,579,712
Total current liabilities	8,815,401	11,301,171
Long-term deferred tax liability	8,882
Other long-term liabilities	4,662,891	3,457,631
Commitments and contingencies (Note 11)
Stockholders' equity:
Preferred stock, $.01 par value, 5,000,000 shares authorized, no shares issued or outstanding	0	0
Common stock, $.01 par value, 80,000,000 shares authorized, 32,658,782 shares at June 30, 2014 and 31,925,741 shares at December 31, 2013 issued and outstanding	326,588	319,257
Additional paid-in capital	196,784,989	190,625,937
Accumulated other comprehensive income	404,639	1,998,330
Accumulated deficit	(81,954,897)	(89,057,422)
Total stockholders' equity	115,561,319	103,886,102
Total liabilities and stockholders' equity	$ 129,048,493	$ 118,644,904