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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Reconciliation of Level 3 Financial Instruments (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2019
USD ($)
Derivative Liability  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Beginning Balance $ 0
Fair value of financial instruments issued 1,442
Change in fair value 11
Reclassification to equity (1,453)
Ending Balance 0
Common Stock Warrant Liability  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Beginning Balance 0
Fair value of financial instruments issued 1,492
Change in fair value 17
Reclassification to equity (1,509)
Ending Balance 0
Redeemable Convertible Preferred Stock Warrant Liability  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Beginning Balance 242
Fair value of financial instruments issued 0
Change in fair value (240)
Reclassification to equity (2)
Ending Balance 0
Contingent Consideration Liabilities  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Beginning Balance 145
Fair value of financial instruments issued 0
Change in fair value 0
Reclassification to equity 0
Ending Balance $ 145