Annual report pursuant to Section 13 and 15(d)

Net Income (Loss) Per Common Share - Additional Information (Detail)

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Net Income (Loss) Per Common Share - Additional Information (Detail)
12 Months Ended
Aug. 01, 2017
shares
Dec. 31, 2017
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Reverse stock split of common stock conversion ratio 11  
Reverse stock split of common stock, description   11-for-1 reverse stock split
Threshold    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Exchange ratio of company common stock shares exchanged for each share owned by private molecular stockholders 7.7844  
Reverse stock split of common stock conversion ratio 11  
Reverse stock split of common stock, description 11-for-1 reverse stock split