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Cash and Cash Equivalents and Short-Term Investments | 6 Months Ended
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Jun. 30, 2019
Cash and Cash Equivalents [Abstract] |
Cash and Cash Equivalents and Short-Term Investments | Cash and Cash Equivalents and Short-Term Investments At June 30, 2019 and December 31, 2018, cash and cash equivalents excluded $0.3 million of restricted cash, which is related to an account established as collateral for a lease arrangement and was included in other assets on the consolidated balance sheets. The following tables summarize the amortized cost, unrealized gain and loss and estimated fair value of cash equivalents and short-term investments:
| June 30, 2019
(in thousands) | Amortized Cost |  | Unrealized Gain |  | Unrealized Loss |  | Estimated Fair Value
Cash equivalents: |  |  |  |  |  |  |
Money market funds | $ | 37,659 |  |  | $ | — |  |  | $ | — |  |  | $ | 37,659 |
Commercial paper | 9,094 |  |  | — |  |  | — |  |  | 9,094 |
Total cash equivalents | $ | 46,753 |  |  | $ | — |  |  | $ | — |  |  | $ | 46,753 |
Short-term investments: |  |  |  |  |  |  |
Commercial paper | $ | 46,220 |  |  | $ | — |  |  | $ | — |  |  | $ | 46,220 |
Corporate bonds | 20,219 |  |  | 37 |  |  | — |  |  | 20,256 |
U.S. Treasury and agency obligations | 44,782 |  |  | 43 |  |  | — |  |  | 44,825 |
Total short-term investments | $ | 111,221 |  |  | $ | 80 |  |  | $ | — |  |  | $ | 111,301 |
| December 31, 2018
(in thousands) | Amortized Cost |  | Unrealized Gain |  | Unrealized Loss |  | Estimated Fair Value
Cash equivalents: |  |  |  |  |  |  |
Money market funds | $ | 38,022 |  |  | $ | — |  |  | $ | — |  |  | $ | 38,022 |
Total cash equivalents | $ | 38,022 |  |  | $ | — |  |  | $ | — |  |  | $ | 38,022 |
Short-term investments: |  |  |  |  |  |  |
Commercial paper | $ | 79,634 |  |  | $ | — |  |  | $ | — |  |  | $ | 79,634 |
Corporate bonds | 16,119 |  |  | — |  |  | — |  |  | 16,119 |
U.S. Treasury and agency obligations | 22,366 |  |  | — |  |  | — |  |  | 22,366 |
Total short-term investments | $ | 118,119 |  |  | $ | — |  |  | $ | — |  |  | $ | 118,119 |
At June 30, 2019 and December 31, 2018, all of our short-term investments had maturities within the next twelve months, and none of our short-term investments were in an unrealized loss position.

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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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