v2.4.0.8
Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Schedule Of Summary Of Significant Accounting Policies [Line Items]      
Restricted cash $ 1,006,000 $ 214,000  
Asset retirement obligations 4,382,000 2,637,000 2,112,000
Deferred rent 3,982,000 4,020,000  
Depreciation expense 46,300,000 29,500,000 22,600,000
Impairment charges 0 0 0
Research and development expense 29,800,000 23,600,000 16,900,000
Additional Paid in Capital, Preferred Stock   0  
Minimum [Member]
      
Schedule Of Summary Of Significant Accounting Policies [Line Items]      
Warranty term 2 years    
Maximum [Member]
      
Schedule Of Summary Of Significant Accounting Policies [Line Items]      
Warranty term 5 years    
Reclassification [Member]
      
Schedule Of Summary Of Significant Accounting Policies [Line Items]      
Restricted cash   214,000  
Asset retirement obligations   2,637,000  
Deferred rent   4,020,000  
Other non-current assets   (256,000) (60,000)
Other non-current liabilities   758,000 190,000
Non-current deferred rent   515,000 (368,000)
Deferred rent   24,000 144,000
Equipment [Member]
      
Schedule Of Summary Of Significant Accounting Policies [Line Items]      
Weighted average useful life of assets 7 years    
Accelerated Depreciation [Member]
      
Schedule Of Summary Of Significant Accounting Policies [Line Items]      
Increase in accelerated depreciation 100,000    
Accelerated Depreciation [Member] | Scenario, Forecast [Member]
      
Schedule Of Summary Of Significant Accounting Policies [Line Items]      
Expected additional accelerated depreciation 1,500,000    
Accelerated Depreciation [Member] | Before reassessment [Member]
      
Schedule Of Summary Of Significant Accounting Policies [Line Items]      
Weighted average useful life of assets 9 years    
Accelerated Depreciation [Member] | After reassessment [Member]
      
Schedule Of Summary Of Significant Accounting Policies [Line Items]      
Weighted average useful life of assets 5 years    
Estimated Useful Lives [Member]
      
Schedule Of Summary Of Significant Accounting Policies [Line Items]      
Increase in accelerated depreciation 4,600,000    
Increased net loss per basic and fully diluted share $ 0.10    
Expected additional accelerated depreciation $ 1,400,000    
Estimated Useful Lives [Member] | Equipment [Member]
      
Schedule Of Summary Of Significant Accounting Policies [Line Items]      
Weighted average useful life of assets 4 years 1 month 6 days