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Income Taxes - Narrative (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Operating Loss Carryforwards [Line Items]    
TCJA, Provisional tax expense (benefit) offset by valuation allowance $ 105,700,000 $ 105,700,000
Change in tax rate reducing deferred tax asset 105,300,000  
TCJA, Provisional income tax expense (benefit)   0
Foreign earnings repatriated 0 0
Cumulative foreign deficits 24,600,000 41,200,000
Increase in opening balance of deferred tax assets 400,000  
Increase in valuation allowance 66,600,000  
Deferred Tax Assets, Tax Benefits Credited to Additional Paid In Capital $ 56,200,000  
Tax credit carryforward, expiration date Jan. 01, 2020  
Tax credit carryforwards subject to expiration $ 2,100,000  
Valuation allowance amount (330,100,000) (263,500,000)
Unrecognized tax benefits 0  
Federal    
Operating Loss Carryforwards [Line Items]    
Operating loss carryforwards $ 578,700,000  
Operating loss carryforwards, expiration dates Jan. 01, 2027  
Federal and state research and development tax credit carryforwards $ 41,100,000  
Deferred Tax Assets, Tax Credit Carryforwards, Research, Subject to Expiration 30,000  
State and Local Jurisdiction    
Operating Loss Carryforwards [Line Items]    
Operating loss carryforwards $ 417,200,000  
Operating loss carryforwards, expiration dates Jan. 01, 2025  
Federal and state research and development tax credit carryforwards $ 41,400,000  
Foreign Tax Authority    
Operating Loss Carryforwards [Line Items]    
Operating loss carryforwards 129,300,000  
Accounting Standards Update 2016-09    
Operating Loss Carryforwards [Line Items]    
Deferred income tax assets   $ 161,800,000
Measurement period adjustment    
Operating Loss Carryforwards [Line Items]    
Increase in valuation allowance 400,000  
Continuing Operations    
Operating Loss Carryforwards [Line Items]    
Increase in valuation allowance 56,900,000  
Additional paid-in capital    
Operating Loss Carryforwards [Line Items]    
Increase in valuation allowance 11,900,000  
Goodwill    
Operating Loss Carryforwards [Line Items]    
Increase in valuation allowance $ 2,200,000