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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] - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Dec. 31, 2018
Jun. 30, 2018
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance $ 19,780 $ 0
Initial fair value of derivative liability   22,968
Change in fair value 18,886 25,952
Reclassification to equity (38,666) (87)
Settlement   (29,053)
Ending balance 0 19,780
Additional Advance Warrant Liability [Member]    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance 0 0
Initial fair value of derivative liability   69
Change in fair value 0 18
Reclassification to equity 0 (87)
Settlement   0
Ending balance 0 0
Second Tranche Warrants Liability [Member]    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance 19,780 0
Initial fair value of derivative liability   18,165
Change in fair value 18,886 1,615
Reclassification to equity (38,666) 0
Settlement   0
Ending balance 0 19,780
Second Tranche Transaction Liability [Member]    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance 0 0
Initial fair value of derivative liability   4,734
Change in fair value 0 24,319
Reclassification to equity 0 0
Settlement   (29,053)
Ending balance $ 0 $ 0