XML 32 R20.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Cash Equivalents and Marketable Securities (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2018
Investments Debt And Equity Securities [Abstract] |
Schedule of Estimated Fair Value of Cash Equivalents and Marketable Securities | The following tables summarize the estimated fair value of the Company’s cash equivalents and marketable securities and the gross unrealized gains and losses (in thousands):
|  | September 30, 2018 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Value |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 6,550 |  |  | $ | — |  |  | $ | — |  |  | $ | 6,550 |
Reverse repurchase agreements |  |  | 6,250 |  |  |  | — |  |  |  | — |  |  |  | 6,250 |
Total cash equivalents |  |  | 12,800 |  |  |  | — |  |  |  | — |  |  |  | 12,800 |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper |  |  | 32,236 |  |  |  | 2 |  |  |  | (8 | ) |  |  | 32,230 |
U.S. government securities |  |  | 18,000 |  |  |  | — |  |  |  | (27 | ) |  |  | 17,973 |
Total marketable securities |  | $ | 50,236 |  |  | $ | 2 |  |  | $ | (35 | ) |  | $ | 50,203 |
|  | December 31, 2017 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Value |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 1,674 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,674 |
Reverse repurchase agreements |  |  | 7,250 |  |  |  | — |  |  |  | — |  |  |  | 7,250 |
Total cash equivalents |  |  | 8,924 |  |  |  | — |  |  |  | — |  |  |  | 8,924 |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  |  | 1,502 |  |  |  | — |  |  |  | (1 | ) |  |  | 1,501 |
U.S. government securities |  |  | 36,082 |  |  |  | — |  |  |  | (101 | ) |  |  | 35,981 |
Total marketable securities |  | $ | 37,584 |  |  | $ | — |  |  | $ | (102 | ) |  | $ | 37,482 |
Summary of Contractual Maturities of Marketable Securities at Estimated Fair Value | The following tables summarizes the contractual maturities of the Company’s marketable securities at estimated fair value (in thousands):
|  | September 30, |  |  | December 31, |
|  | 2018 |  |  | 2017 |
Due in one year or less |  | $ | 50,203 |  |  | $ | 34,498 |
Due in 1 - 2 years |  |  | — |  |  |  | 2,984 |
Total marketable securities |  | $ | 50,203 |  |  | $ | 37,482 |

X
- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
Name: | us-gaap_InvestmentsClassifiedByContractualMaturityDateTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the components of cash, cash equivalents, and investments. + References No definition available. + Details
Name: | us-gaap_ScheduleOfCashCashEquivalentsAndShortTermInvestmentsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration