6. Accrued Expenses and Other Current Liabilities (Detail) - (Table 1) Accrued expenses and other current liabilities (USD $)	Dec. 31, 2012	Dec. 31, 2011
Accrued compensation and benefits	$ 635,039	$ 296,425
Accrued interest	265,719	103,917
Accrued product warranty liability	263,000	140,000
Other accrued expenses	211,130	365,131
Customer deposits	79,384	181,423
Accrued rent	39,674
Accrued professional fees	21,388	92,160
	$ 1,515,334	$ 1,179,056