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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Jan. 02, 2018
Dec. 31, 2017
 [1]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Current assets $ 135,320 $ 5,000 $ 149,712
Current liabilities 13,162 1,000 17,871
Accumulated deficit (291,232) 4,000 $ (278,214)
Cost of revenue 464    
License      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Licensing revenue 2,320    
Adjustments | ASU 2014-09      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Current assets 5,000 5,000  
Current liabilities 1,000 1,000  
Accumulated deficit 4,000 $ 4,000  
Before topic 606 | ASU 2014-09      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Current assets 130,320    
Current liabilities 12,162    
Accumulated deficit (295,232)    
Before topic 606 | ASU 2014-09 | License      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Licensing revenue 2,320    
Cost of revenue $ 464    
[1] Derived from the audited consolidated financial statements included in the Company’s Annual Report on Form 10K for the year ended December 31, 2017.