Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurement - Summary of Fair Value Assets and Liabilities (Details)

v3.19.3
Fair Value Measurement - Summary of Fair Value Assets and Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Trade-in Guarantee    
Liabilities:    
Liabilities   $ 268
Money Market Funds    
Assets:    
Assets $ 14,050 11,006
Level 1 | Money Market Funds    
Assets:    
Assets $ 14,050 11,006
Level 3 | Trade-in Guarantee    
Liabilities:    
Liabilities   $ 268