XML 63 R11.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Concentration of Credit Risk | 12 Months Ended
--- | ---
Dec. 31, 2019
Risks And Uncertainties [Abstract] |
Concentration of Credit Risk | Note 2 - Concentration of Credit Risk Financial instruments that potentially subject us to concentration of credit risk consist primarily of cash equivalents, investments, restricted cash and investments, and trade accounts receivable. We limit investment of cash equivalents and investments to financial institutions with high credit ratings. Credit risk on trade accounts is minimized as a result of the large and diverse nature of our customer base. At December 31, 2019, we had concentrations of credit risk as follows:
| • | $154.1 million, at fair value, in corporate bonds.
| • | $66.5 million, at fair value, in mortgage backed securities.
| • | $64.6 million, at fair value, in money market funds.
| • | $36.2 million, at fair value, in U.S. government agency securities.
| • | $21.4 million, at fair value, in U.S. treasuries.
| • | $14.3 million, at fair value, in asset backed securities.

X
- Definition The entire disclosure for any concentrations existing at the date of the financial statements that make an entity vulnerable to a reasonably possible, near-term, severe impact. This disclosure informs financial statement users about the general nature of the risk associated with the concentration, and may indicate the percentage of concentration risk as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -URI http://asc.fasb.org/topic&trid=2134479 + Details
Name: | us-gaap_ConcentrationRiskDisclosureTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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