XML 66 R53.htm IDEA: XBRL DOCUMENT
v3.20.1

Income Tax - Summary of Investment Tax Credits and Non-Capital Losses and Net Operating Losses (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items] |  |
Net Operating Losses | $ 25,300 | $ 17,600
Canada |  |
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items] |  |
Non-capital Losses | 104,213 |
UK |  |
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items] |  |
Net Operating Losses | 2,691 | 1,800
US [Member] |  |
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items] |  |
Net Operating Losses | 25,291 |
Investment tax credits carryforwards [Member] |  |
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items] |  |
Investment Tax Credits | 2,973 |
Investment tax credits carryforwards [Member] | Canada |  |
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items] |  |
Investment Tax Credits | 2,900 | $ 2,600
2022 [Member] | Investment tax credits carryforwards [Member] |  |
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items] |  |
Investment Tax Credits | 1 |
2025 [Member] | Investment tax credits carryforwards [Member] |  |
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items] |  |
Investment Tax Credits | 244 |
2026 [Member] | Canada |  |
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items] |  |
Non-capital Losses | 7,660 |
2026 [Member] | Investment tax credits carryforwards [Member] |  |
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items] |  |
Investment Tax Credits | 71 |
2027 [Member] | Canada |  |
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items] |  |
Non-capital Losses | 6,082 |
2028 [Member] | Canada |  |
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items] |  |
Non-capital Losses | 7,256 |
2028 [Member] | Investment tax credits carryforwards [Member] |  |
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items] |  |
Investment Tax Credits | 111 |
2029 [Member] | Canada |  |
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items] |  |
Non-capital Losses | 1,712 |
2029 [Member] | US [Member] |  |
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items] |  |
Net Operating Losses | 9 |
2029 [Member] | Investment tax credits carryforwards [Member] |  |
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items] |  |
Investment Tax Credits | 317 |
2030 [Member] | Canada |  |
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items] |  |
Non-capital Losses | 6,770 |
2030 [Member] | US [Member] |  |
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items] |  |
Net Operating Losses | 5 |
2030 [Member] | Investment tax credits carryforwards [Member] |  |
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items] |  |
Investment Tax Credits | 346 |
2031 [Member] | Canada |  |
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items] |  |
Non-capital Losses | 12,354 |
2031 [Member] | UK |  |
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items] |  |
Net Operating Losses | 36 |
2031 [Member] | US [Member] |  |
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items] |  |
Net Operating Losses | 17 |
2031 [Member] | Investment tax credits carryforwards [Member] |  |
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items] |  |
Investment Tax Credits | 486 |
2032 [Member] | Canada |  |
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items] |  |
Non-capital Losses | 17,278 |
2032 [Member] | UK |  |
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items] |  |
Net Operating Losses | 42 |
2032 [Member] | US [Member] |  |
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items] |  |
Net Operating Losses | 43 |
2032 [Member] | Investment tax credits carryforwards [Member] |  |
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items] |  |
Investment Tax Credits | 363 |
2033 [Member] | Canada |  |
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items] |  |
Non-capital Losses | 23,240 |
2033 [Member] | UK |  |
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items] |  |
Net Operating Losses | 54 |
2033 [Member] | US [Member] |  |
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items] |  |
Net Operating Losses | 2 |
2033 [Member] | Investment tax credits carryforwards [Member] |  |
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items] |  |
Investment Tax Credits | 193 |
2034 [Member] | Canada |  |
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items] |  |
Non-capital Losses | 17,077 |
2034 [Member] | UK |  |
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items] |  |
Net Operating Losses | 46 |
2034 [Member] | US [Member] |  |
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items] |  |
Net Operating Losses | 3 |
2034 [Member] | Investment tax credits carryforwards [Member] |  |
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items] |  |
Investment Tax Credits | 215 |
2035 [Member] | Canada |  |
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items] |  |
Non-capital Losses | 3,112 |
2035 [Member] | UK |  |
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items] |  |
Net Operating Losses | 27 |
2035 [Member] | US [Member] |  |
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items] |  |
Net Operating Losses | 654 |
2035 [Member] | Investment tax credits carryforwards [Member] |  |
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items] |  |
Investment Tax Credits | 122 |
2036 [Member] | Canada |  |
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items] |  |
Non-capital Losses | 5,361 |
2036 [Member] | UK |  |
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items] |  |
Net Operating Losses | 58 |
2036 [Member] | US [Member] |  |
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items] |  |
Net Operating Losses | 611 |
2036 [Member] | Investment tax credits carryforwards [Member] |  |
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items] |  |
Investment Tax Credits | 79 |
2037 [Member] | Canada |  |
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items] |  |
Non-capital Losses | (5,295) |
2037 [Member] | UK |  |
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items] |  |
Net Operating Losses | 493 |
2037 [Member] | US [Member] |  |
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items] |  |
Net Operating Losses | 8,763 |
2037 [Member] | Investment tax credits carryforwards [Member] |  |
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items] |  |
Investment Tax Credits | 22 |
2038 [Member] | Canada |  |
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items] |  |
Non-capital Losses | (3,179) |
2038 [Member] | UK |  |
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items] |  |
Net Operating Losses | 887 |
2038 [Member] | US [Member] |  |
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items] |  |
Net Operating Losses | 7,207 |
2038 [Member] | Investment tax credits carryforwards [Member] |  |
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items] |  |
Investment Tax Credits | 202 |
2039 [Member] | Canada |  |
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items] |  |
Non-capital Losses | 4,785 |
2039 [Member] | UK |  |
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items] |  |
Net Operating Losses | 1,048 |
2039 [Member] | US [Member] |  |
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items] |  |
Net Operating Losses | 7,977 |
2039 [Member] | Investment tax credits carryforwards [Member] |  |
Schedule Of Tax Credits And Losses Carry Forward Expiration [Line Items] |  |
Investment Tax Credits | $ 201 |

X
- Definition Non capital gain loss carryforwards amount. + References No definition available. + Details
Name: | achv_NonCapitalGainLossCarryforwardsAmount
Namespace Prefix: | achv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Schedule of tax credits and losses carry forward expiration line items. + References No definition available. + Details
Name: | achv_ScheduleOfTaxCreditsAndLossesCarryForwardExpirationLineItems
Namespace Prefix: | achv_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
Name: | us-gaap_OperatingLossCarryforwards
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
Name: | us-gaap_TaxCreditCarryforwardAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | srt_StatementGeographicalAxis=country_CA
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=country_GB
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeTaxAuthorityNameAxis=us-gaap_InternalRevenueServiceIRSMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TaxCreditCarryforwardAxis=us-gaap_InvestmentCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TaxPeriodAxis=achv_CarryForwardExpirationYearElevenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TaxPeriodAxis=achv_CarryForwardExpirationYearFourteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TaxPeriodAxis=achv_CarryForwardExpirationYearFifteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TaxPeriodAxis=achv_CarryForwardExpirationYearSixteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TaxPeriodAxis=achv_CarryForwardExpirationYearSeventeenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TaxPeriodAxis=achv_CarryForwardExpirationYearEighteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TaxPeriodAxis=achv_CarryForwardExpirationYearNineteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TaxPeriodAxis=achv_CarryForwardExpirationYearTwentyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TaxPeriodAxis=achv_CarryForwardExpirationYearTwentyOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TaxPeriodAxis=achv_CarryForwardExpirationYearTwentyTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TaxPeriodAxis=achv_CarryForwardExpirationYearTwentyThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TaxPeriodAxis=achv_CarryForwardExpirationYearTwentyFourMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TaxPeriodAxis=achv_CarryForwardExpirationYearTwentyFiveMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TaxPeriodAxis=achv_CarryForwardExpirationYearTwentySixMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TaxPeriodAxis=achv_CarryForwardExpirationYearTwentySevenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TaxPeriodAxis=achv_CarryForwardExpirationYearTwentyEightMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |