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Net Loss Per Share - Additional Information (Detail)
3 Months Ended 12 Months Ended
May 22, 2018
shares
Oct. 10, 2017
shares
Jul. 01, 2017
shares
Jun. 30, 2018
CommercialTest
shares
Mar. 31, 2018
shares
Dec. 31, 2017
shares
Apr. 17, 2018
USD ($)
shares
Contingent Consideration Liability [Member] | ImmuMetrix, Inc. [Member]              
Schedule of Net Income (Loss) Per Share [Line Items]              
Number of completed commercial tests | CommercialTest       2,500      
Number of shares issued pursuant to contingent consideration 227,845     227,845      
JGB Debt [Member]              
Schedule of Net Income (Loss) Per Share [Line Items]              
Shares issued upon conversion     1,022,544   6,415,039 6,415,039  
Perceptive Credit Agreement [Member]              
Schedule of Net Income (Loss) Per Share [Line Items]              
Aggregate principal amount | $             $ 15,000,000
Perceptive Credit Agreement [Member] | Tranche B Term Loan [Member]              
Schedule of Net Income (Loss) Per Share [Line Items]              
Aggregate principal amount | $             $ 10,000,000
Perceptive Credit Agreement [Member] | Tranche B Term Loan [Member] | Maximum [Member]              
Schedule of Net Income (Loss) Per Share [Line Items]              
Warrant to purchase stock, shares             93,333
Underwritten Public Offering [Member]              
Schedule of Net Income (Loss) Per Share [Line Items]              
Common stock shares issued   4,992,840