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Schedule of Adoption of New Revenue Guidance Impact on Condensed Consolidated Statement of Cash Flows (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Cash Flows from Operating Activities        
Net loss $ (24,168) $ (32,886) $ (77,224) $ (84,549)
Changes in operating assets and liabilities:        
Accounts receivable, net     (74) (1,502)
Deferred costs from commercial product sales       234
Accrued expenses and other current liabilities     560 2,889
Deferred revenue, net       $ (398)
Cash (used in) provided by operating activities     (62,719)  
Adjustments | Accounting Standards Update 2014-09        
Cash Flows from Operating Activities        
Net loss (137)   (196)  
Changes in operating assets and liabilities:        
Accounts receivable, net     111  
Deferred costs from commercial product sales     358  
Accrued expenses and other current liabilities     (588)  
Deferred revenue, net     (563)  
Cash (used in) provided by operating activities     (878)  
Balances Without Adoption of Topic 606 | Accounting Standards Update 2014-09        
Cash Flows from Operating Activities        
Net loss $ (24,305)   (77,420)  
Changes in operating assets and liabilities:        
Accounts receivable, net     37  
Deferred costs from commercial product sales     358  
Accrued expenses and other current liabilities     (28)  
Deferred revenue, net     (563)  
Cash (used in) provided by operating activities     $ (63,597)