Commitments and Contingencies - Additional Information (Detail) (USD $)	3 Months Ended	9 Months Ended				9 Months Ended				3 Months Ended		1 Months Ended	3 Months Ended	12 Months Ended
	Sep. 30, 2012 Positions	Sep. 30, 2013	Sep. 30, 2012	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2013 Antenna [Member]	Sep. 30, 2013 Scanning [Member] Minimum [Member]	Sep. 30, 2013 Scanning [Member] Maximum [Member]	Sep. 30, 2013 Disposal of TelWorx Inventory [Member]	Sep. 30, 2012 Employee Severance [Member]	Sep. 30, 2013 Office equipment [Member]	Jul. 31, 2012 TelWorx Communications LLC [Member]	Dec. 31, 2012 TelWorx Communications LLC [Member]	Dec. 31, 2012 TelWorx Communications LLC [Member]
Restructuring Cost and Reserve [Line Items]
Office equipment											$ 3,000
Accumulated depreciation		15,492,000			14,590,000						1,000
Office equipment, net		14,619,000			14,775,000						2,000
Allowance for sales returns		200,000			100,000
Repair and replacement warranty						2 years	1 year	3 years
Warranty reserve		300,000			300,000
Restructuring expenses		156,000	0						300,000	200,000
Number of positions eliminated	12
Lease expiration period		5 years
Rental payments		200,000
Cash payments		4,300,000
Working capital adjustment provisions		1,000,000
Potential contingent consideration earnable under the Original Agreement		1,500,000
Fair value in the form common stock		600,000
Parties agreed to the elimination of the holdback		500,000
Notice period for termination of leaves under option		180 days
Settlement agreement fair value				5,400,000
Settlement agreement remaining consideration				4,300,000
Cash agreed to be paid to company under agreement				3,200,000
Asset purchase agreement contingent consideration				600,000
Asset purchase agreement escrow deposit				500,000
Goodwill impairment												$ 16,100,000	$ 12,500,000	$ 12,500,000