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Marketable Securities (Tables) | 6 Months Ended
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Jun. 30, 2019
Marketable Securities [Abstract] |
Available-for-sale Securities | Marketable securities as of June 30, 2019 and December 31, 2018 consisted of the following:
June 30, 2019 | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Money market mutual funds | $ | 50,057 |  |  | $ | — |  |  | $ | — |  |  | $ | 50,057 |
Total marketable securities designated as available-for-sale | $ | 50,057 |  |  | $ | — |  |  | $ | — |  |  | $ | 50,057 |
December 31, 2018 | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Money market mutual funds | $ | 25 |  |  | $ | — |  |  | $ | — |  |  | $ | 25 |
Total marketable securities designated as available-for-sale | $ | 25 |  |  | $ | — |  |  | $ | — |  |  | $ | 25 |
Available-for-sale Securities, Debt Maturities, Amortized Cost And Fair Value Basis | The amortized costs and fair value of marketable securities as of June 30, 2019 and December 31, 2018 are shown below by effective maturity. Effective maturities may differ from contractual maturities because the issuers of the securities may have the right to prepay obligations without prepayment penalties.
June 30, 2019 | Amortized Cost |  | Fair Value
Due in less than one year | $ | — |  |  | $ | — |
December 31, 2018 | Amortized Cost |  | Fair Value
Due in less than one year | $ | — |  |  | $ | — |

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- Definition Available-for-sale Securities, Debt Maturities, Amortized Cost And Fair Value Basis [Table Text Block] + References No definition available. + Details
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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
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