XML 42 R30.htm IDEA: XBRL DOCUMENT
v3.20.2

Note A - Overview and Significant Accounting Policies (Details Textual) $ in Millions |  | 6 Months Ended
--- | --- | ---
Jan. 30, 2018 USD ($) shares | Jun. 30, 2020
Number of Reportable Segments |  | 1
Founder of Snap Kitchen [Member] |  |
Related Party, Ownership Percentage |  | 9.00%
Securities Purchase Agreement [Member] | Series A Preferred Stock [Member] | Wipro [Member] |  |
Sale of Stock, Number of Shares Issued in Transaction (in shares) | shares | 9,926 |
Convertible Preferred Stock, Shares Issued upon Conversion as Percent of Common Stock Outstanding | 16.00% |
Sale of Stock, Consideration Received on Transaction | $ | $ 9.9 |

X
- Definition Represents shares issued upon conversion as percentage of common stock outstanding for convertible preferred stock. + References No definition available. + Details
Name: | hrth_ConvertiblePreferredStockSharesIssuedUponConversionAsPercentOfCommonStockOutstanding
Namespace Prefix: | hrth_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The ownership percentage of the related party in the company. + References No definition available. + Details
Name: | hrth_RelatedPartyOwnershipPercentage
Namespace Prefix: | hrth_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8672-108599 + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Cash received on stock transaction after deduction of issuance costs. + References No definition available. + Details
Name: | us-gaap_SaleOfStockConsiderationReceivedOnTransaction
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The number of shares issued or sold by the subsidiary or equity method investee per stock transaction. + References No definition available. + Details
Name: | us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=hrth_FounderOfSnapKitchenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=hrth_SecuritiesPurchaseAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_SeriesAPreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CounterpartyNameAxis=hrth_WiproMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |