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Fair Value Measurements - Summary of Changes in Fair Value of Company's Level 3 Financial Instruments (Detail) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Warrant Liability [Member]    
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Beginning balance   $ 303
Change in fair value   67
Reclassification of warrant liability to common equity upon Merger   (370)
Put options on convertible promissory notes [Member]    
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Beginning balance   979
Change in fair value   169
Put option at issuance of convertible promissory notes   828
Conversion of convertible promissory notes   (1,976)
Contingent Consideration [Member]    
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Beginning balance $ 11,948 9,708
Change in fair value 131 2,240
Ending balance $ 12,079 $ 11,948