Commitments and Contingencies - Additional Information (Detail)
$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Jul. 14, 2015
USD ($)
Jul. 14, 2014
Satellite
Dec. 21, 2012
USD ($)
Jan. 31, 2016
USD ($)
Jun. 30, 2015
USD ($)
Apr. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2001
USD ($)
Apr. 18, 2014
USD ($)
Mar. 20, 2014
USD ($)
Long Term Purchase Commitment [Line Items]                          
Non-cash impairment charge             $ 12,748 $ 12,748 $ 605        
Lease payment and rent expense               2,692 2,384 $ 2,554      
In-orbit OG2 Satellites One [Member]                          
Long Term Purchase Commitment [Line Items]                          
Non-cash impairment charge         $ 12,748   $ 12,748            
Removal/decrease in satellite network and other equipment         13,788     13,788          
Accumulated depreciation on equipment         $ 1,040     1,040          
Subsequent Event [Member]                          
Long Term Purchase Commitment [Line Items]                          
Milestone payments       $ 1,246                  
Second Amendment [Member]                          
Long Term Purchase Commitment [Line Items]                          
Procurement agreement contract price excluding optional satellites                         $ 117,000
Falcon Nine Agreement [Member]                          
Long Term Purchase Commitment [Line Items]                          
Contract price     $ 42,600                    
OG2 Satellite Procurement [Member]                          
Long Term Purchase Commitment [Line Items]                          
Number of satellites | Satellite   6                      
Carrier Data Providers [Member]                          
Long Term Purchase Commitment [Line Items]                          
Future minimum payments for the year, 2016               6,854          
Future minimum payments for the year, 2017               7,424          
Future minimum payments for the year, 2018               5,814          
Future minimum payments for the year, 2019               3,761          
Future minimum payments for the year, 2020               3,761          
Vendor Parts Supplier [Member]                          
Long Term Purchase Commitment [Line Items]                          
Future minimum payments for the year, 2016               520          
Future minimum payments for the year, 2017               1,017          
Future minimum payments for the year, 2018               1,950          
Future minimum payments for the year, 2019               1,058          
Procurement Agreement [Member]                          
Long Term Purchase Commitment [Line Items]                          
Remaining operational milestone payments               8,255          
Unused credits granted               2,038 2,067        
Procurement Agreement [Member] | Airtime [Member]                          
Long Term Purchase Commitment [Line Items]                          
Credits provided               $ 29 $ 30 $ 31      
Procurement Agreement [Member] | Airtime [Member] | Europe [Member]                          
Long Term Purchase Commitment [Line Items]                          
Credits provided                     $ 3,736    
Procurement Agreement [Member] | Subsequent Event [Member]                          
Long Term Purchase Commitment [Line Items]                          
Milestone payments       $ 3,185                  
Procurement Agreement Five Additional Task Order [Member]                          
Long Term Purchase Commitment [Line Items]                          
Procurement agreement fixed price contract amount                       $ 2,700  
Launch Plus One Year In Orbit Insurance Coverage for First Launch of Six Satellites [Member]                          
Long Term Purchase Commitment [Line Items]                          
Insurance coverage on launch of satellite program           $ 66,000              
Launch Vehicle Flight Only Insurance Coverage for First Launch of Six Satellites [Member]                          
Long Term Purchase Commitment [Line Items]                          
Insurance coverage on launch of satellite program           22,000              
First Launch of Six Satellites [Member]                          
Long Term Purchase Commitment [Line Items]                          
Premium cost for launch of satellite           9,953              
Launch Plus One Year In Orbit Insurance Coverage for Second Launch of Eleven Satellites [Member]                          
Long Term Purchase Commitment [Line Items]                          
Insurance coverage on launch of satellite program           120,000              
Launch Vehicle Flight Only Insurance Coverage for Second Launch of Eleven Satellites [Member]                          
Long Term Purchase Commitment [Line Items]                          
Insurance coverage on launch of satellite program           22,000              
Second Launch of Eleven Satellites [Member]                          
Long Term Purchase Commitment [Line Items]                          
Premium cost for launch of satellite           $ 16,454              
Percentage of premium as to aggregate premium           5.00%              
Launch Plus One Year In-orbit Insurance Coverage for Five Satellites [Member]                          
Long Term Purchase Commitment [Line Items]                          
Insurance coverage on launch of satellite program $ 40,000