Supplemental Cash Flow Information (Detail) (USD $)	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Schedule of Cash Flow, Supplemental [Line Items]
Cash paid for interest	$ 126,000	$ 228,000
Non-cash investing and financing activities:
Beneficial conversion feature issued with convertible debt	216,000
Conversion of debt and accrued interest to equity	580,000
Warrant issued for prepaid consulting services	248,000
Loss from change in fair value of interest rate swap derivative	22,000
Refinance of related party revolving line of credit and accrued interest		650,000
Retirement of derivative warrant liability		3,506,000
Business Combinations
Non-cash investing and financing activities:
Equity issued for acquisition		$ 274,000