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Marketable Securities (Tables) | 9 Months Ended
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Sep. 30, 2019
Marketable Securities [Abstract] |
Marketable Securities | Marketable securities as of September 30, 2019 and December 31, 2018 consisted of the following:
September 30, 2019 | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Money market mutual funds | $ | 46,325 |  |  | $ | — |  |  | $ | — |  |  | $ | 46,325 |
Total marketable securities designated as available-for-sale | $ | 46,325 |  |  | $ | — |  |  | $ | — |  |  | $ | 46,325 |
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 |
Amortized Costs and Fair Value of Marketable Securities | The amortized costs and fair value of marketable securities as of September 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.
September 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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