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Fair Value Measurements - Summary of Changes in Fair Value of the Company's Derivative Liability (Detail) - Significant Unobservable Inputs (Level 3) [Member]
$ in Thousands
9 Months Ended
Sep. 30, 2018
USD ($)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Beginning balance $ 0
Initial fair value of derivative liability 22,968
Change in fair value 44,838
Reclassification to equity (38,753)
Settlement (29,053)
Ending balance 0
Additional Advance Warrant Liability [Member]  
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Beginning balance 0
Initial fair value of derivative liability 69
Change in fair value 18
Reclassification to equity (87)
Settlement 0
Ending balance 0
Second Tranche Transaction Liability [Member]  
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Beginning balance 0
Initial fair value of derivative liability 4,734
Change in fair value 24,319
Reclassification to equity 0
Settlement (29,053)
Ending balance 0
Second Tranche Warrants [Member]  
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Beginning balance 0
Initial fair value of derivative liability 18,165
Change in fair value 20,501
Reclassification to equity (38,666)
Settlement 0
Ending balance $ 0