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Cash, Cash Equivalents and Short-Term Investments | 12 Months Ended
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Dec. 31, 2018
Cash and Cash Equivalents [Abstract] |
Cash, Cash Equivalents and Short-Term Investments | Cash, Cash Equivalents and Short-Term Investments The amortized cost, unrealized gains and losses and estimated fair value of the Company's cash, cash equivalents and short-term investments as of December 31, 2018 consisted of the following:
| Amortized cost |  | Unrealized gain |  | Unrealized loss |  | Estimated fair value
Cash | $ | 103.0 |  |  | $ | — |  |  | $ | — |  |  | 103.0 |
Cash equivalents |  |  |  |  |  |  |
Money market funds | 355.5 |  |  | — |  |  | — |  |  | 355.5 |
Commercial paper | 27.4 |  |  | — |  |  | — |  |  | 27.4 |
U.S. Treasury securities | 33.4 |  |  | — |  |  | — |  |  | 33.4 |
Total cash and cash equivalents | $ | 519.3 |  |  | $ | — |  |  | $ | — |  |  | $ | 519.3 |
Short-term investments |  |  |  |  |  |  |
Corporate notes and obligations | 269.6 |  |  | 0.1 |  |  | (0.5 | ) |  | 269.2 |
U.S. Treasury securities | 176.0 |  |  | — |  |  | (0.1 | ) |  | 175.9 |
Certificates of deposit | 70.6 |  |  | — |  |  | — |  |  | 70.6 |
U.S. agency obligations | 37.1 |  |  | — |  |  | — |  |  | 37.1 |
Commercial paper | 17.2 |  |  | — |  |  | — |  |  | 17.2 |
Total short-term investments | 570.5 |  |  | 0.1 |  |  | (0.6 | ) |  | 570.0 |
Total | $ | 1,089.8 |  |  | $ | 0.1 |  |  | $ | (0.6 | ) |  | $ | 1,089.3 |
The Company's cash and cash equivalents at December 31, 2017 consisted of cash of $62.9 million and money market funds of $367.1 million. The Company did not have short-term investments as of December 31, 2017. Included in cash and cash equivalents is cash in transit from payment processors for credit and debit card transactions of $11.9 million and $13.3 million as of December 31, 2018 and December 31, 2017, respectively. All short-term investments were designated as available-for-sale securities as of December 31, 2018. The following table presents the contractual maturities of the Company’s short-term investments as of December 31, 2018:
| Amortized cost |  | Estimated fair value
Due within one year | $ | 327.6 |  |  | $ | 327.5 |
Due between one to three years | 242.9 |  |  | 242.5 |
Total | $ | 570.5 |  |  | $ | 570.0 |
As of December 31, 2018, the following short-term investments were in unrealized loss positions:
| Less than 12 months |  | 12 months or greater |  | Total
| Fair value |  | Unrealized losses |  | Fair value |  | Unrealized losses |  | Fair value |  | Unrealized losses
Corporate notes and obligations | $ | 209.5 |  |  | $ | (0.5 | ) |  | $ | — |  |  | $ | — |  |  | $ | 209.5 |  |  | $ | (0.5 | )
U.S. Treasury securities | 127.8 |  |  | (0.1 | ) |  | — |  |  | — |  |  | 127.8 |  |  | (0.1 | )
Total | $ | 337.3 |  |  | $ | (0.6 | ) |  | $ | — |  |  | $ | — |  |  | $ | 337.3 |  |  | $ | (0.6 | )
The Company had 202 short-term investments in unrealized loss positions as of December 31, 2018. There were no material gross unrealized losses from available-for-sale securities and no material realized gains or losses from available-for-sale securities that were reclassified out of accumulated other comprehensive income for the year ended December 31, 2018. For investments in available-for-sale debt securities that have unrealized losses, the Company evaluates whether (i) it has the intention to sell any of these investments and (ii) whether it is not more likely than not that it will be required to sell any of these investments before recovery of the entire amortized cost basis. Based on this evaluation, the Company determined that there were no other-than-temporary impairments associated with short-term investments as of December 31, 2018. The Company recorded $16.8 million, $3.0 million, and $0.9 million in interest income from its cash, cash equivalents and short-term investments for the years ended December 31, 2018, 2017 and 2016, respectively.

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- Definition The entire disclosure of the components of cash, cash equivalents, and short-term investments. Short-term investments may include current marketable securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 305 -URI http://asc.fasb.org/topic&trid=2122426 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
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