Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurement - Summary of Changes in Fair Value of Company's Level 3 Financial Liabilities (Details)

v3.19.2
Fair Value Measurement - Summary of Changes in Fair Value of Company's Level 3 Financial Liabilities (Details) - Level 3 - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Trade-In Guarantee    
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Beginning Balance $ 268 $ 805
Recognition of revenue $ (268) 0
Change in fair value   0
Ending Balance   805
Warrant Liability    
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Beginning Balance   3,785
Recognition of revenue   0
Change in fair value   0
Ending Balance   $ 3,785