Annual report pursuant to Section 13 and 15(d)

Merger with Private Molecular - Purchase Price for Threshold on Closing Date of Merger (Detail)

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Merger with Private Molecular - Purchase Price for Threshold on Closing Date of Merger (Detail) - Threshold - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended
Aug. 01, 2017
Sep. 30, 2017
Business Acquisition [Line Items]    
Number of share of the combined company owned by Threshold stockholders 6,508,356  
Multiplied by the price per share of Threshold common stock $ 5.94  
Purchase price before options $ 38,658  
Threshold options assumed 1,006  
Settlement of preexisting bridge note with Threshold (4,010) $ (4,000)
Total purchase price $ 35,654