XML 42 R31.htm IDEA: XBRL DOCUMENT
v3.20.2

Marketable Securities Marketable Securities (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2020
Marketable Securities [Abstract] |
Available-for-sale Securities [Table Text Block] | The schedule of maturities at September 30, 2020 and December 31, 2019 is as follows:
| Maturities as of September 30, 2020 |  | Maturities as of December 31, 2019
| 1 Year or Less |  | 1 to 4 Years |  | 1 Year or Less |  | 1 to 4 Years
Certificates of deposit | $ | 33,332 |  |  | $ | — |  |  | $ | 40,521 |  |  | $ | — |
Total | $ | 33,332 |  |  | $ | — |  |  | $ | 40,521 |  |  | $ | — |

X
- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References No definition available. + Details
Name: | us-gaap_AvailableForSaleSecuritiesTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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