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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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Cash Flows from Operating Activities        
Net loss $ (22,675) $ (35,339) $ (53,060) $ (51,663)
Changes in operating assets and liabilities:        
Accounts receivable, net     (170) (1,010)
Deferred costs from commercial product sales       191
Accrued expenses and other current liabilities     818 (483)
Deferred revenue, net       $ (827)
Cash (used in) provided by operating activities     (48,800)  
Adjustments | Accounting Standards Update 2014-09        
Cash Flows from Operating Activities        
Net loss (178)   202  
Changes in operating assets and liabilities:        
Accounts receivable, net     (188)  
Deferred costs from commercial product sales     (1)  
Accrued expenses and other current liabilities     170  
Deferred revenue, net     (348)  
Cash (used in) provided by operating activities     (165)  
Balances Without Adoption of Topic 606 | Accounting Standards Update 2014-09        
Cash Flows from Operating Activities        
Net loss $ (22,853)   (52,858)  
Changes in operating assets and liabilities:        
Accounts receivable, net     (358)  
Deferred costs from commercial product sales     (1)  
Accrued expenses and other current liabilities     988  
Deferred revenue, net     (348)  
Cash (used in) provided by operating activities     $ (48,965)