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Fair Value of Financial Instruments (Tables)
 9 Months Ended
Sep. 30, 2018
Fair Value Disclosures [Abstract]  
Assets Measured on Recurring Basis The following is a summary of fair value measurements at September 30, 2018 and December 31, 2017 (in thousands):
As of September 30, 2018:
Carrying Value
Level 1
Level 2
Level 3
Assets:
Money market funds (1)
$438,386 $438,386 $— $— 

As of December 31, 2017:
Carrying Value
Level 1
Level 2
Level 3
Assets:
Money market funds (1)
$171,859 $171,859 $— $— 
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(1) Consists of highly liquid investments with original maturities of three months or less and classified in cash and cash equivalents in the accompanying unaudited condensed consolidated balance sheets.
Carrying Value and Fair Value of Finance Receivables The carrying value and fair value of the finance receivables as of September 30, 2018 and December 31, 2017 were as follows (in thousands):
September 30, 2018December 31, 2017
Carrying value $88,151 $45,564 
Fair value 91,400 47,514