Income Taxes (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Deferred income tax assets:
Net operating loss carryforward	$ 46,531	$ 634,802
Deferred warranty revenue	1,759,130	1,674,984
Inventory reserve	905,892	1,712,978
Non-qualified and Non-employee stock option expense	3,682,049	2,842,811
Capitalized research and development	8,191,276	9,677,167
Alternative minimum tax carryforward	1,406,045	1,657,287
Research and development tax credit carryforward	2,936,418	5,088,136
Impairment Loss	230,415	902,675
Deferred Legal Settlement	722,793	1,277,323
Reserves, accruals, and other	1,925,307	1,905,311
Total deferred income tax assets	21,805,856	27,373,474
Deferred income tax liabilities:
Depreciation	(662,172)	(3,133,145)
Amortization	(141,885)	(126,659)
Total deferred income tax liabilities	(804,057)	(3,259,804)
Net deferred income tax assets before valuation allowance	21,001,799	24,113,670
Less: Valuation allowance		(1,428,572)
Net deferred income tax assets	$ 21,001,799	$ 22,685,098