Commitments and Contingencies - Additional Information (Detail) $ in Thousands			1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Oct. 10, 2014 USD ($)	Sep. 30, 2014 USD ($)	May. 31, 2015 USD ($) ft²	Jun. 30, 2015 USD ($) ft² Employees	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) ft² Employees	Jun. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Commitments And Contingencies Disclosure [Line Items]
Rent expense under leases				$ 300	$ 200	$ 500	$ 400
Allowance for sales returns						100		$ 100
Warranty reserve				304		304		304
Restructuring Expense				$ 440	0	$ 440	0
Number of employees | Employees				2		2
Employee Related Costs [Member]
Commitments And Contingencies Disclosure [Line Items]
Restructuring Expense				$ 34		$ 34
Mobile Towers [Member]
Commitments And Contingencies Disclosure [Line Items]
Intangible assets written off related to mobile towers				$ 400
Other Party [Member]
Commitments And Contingencies Disclosure [Line Items]
Acquisition related legal settlements	$ 800
Acquisition Related Costs [Member]
Commitments And Contingencies Disclosure [Line Items]
Acquisition related legal settlements		$ 100
Schaumburg, Illinois [Member]
Commitments And Contingencies Disclosure [Line Items]
Area of office space | ft²				6,652		6,652
Lease expiration date						Oct. 31, 2018
Lease obligations			$ 39	$ 400		$ 400
Englewood, Colorado [Member]
Commitments And Contingencies Disclosure [Line Items]
Area of office space | ft²			4,579
Lease expiration date			Feb. 28, 2021
Lease obligations			$ 600
Lease Term One			5 years
Warranty Reserves [Member]
Commitments And Contingencies Disclosure [Line Items]
Warranty reserve				$ 304	$ 280	$ 304	$ 280	$ 304	$ 305
Antenna [Member]
Commitments And Contingencies Disclosure [Line Items]
Repair and replacement warranty						5 years