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Commitments and Contingencies - Summary of Contractual Obligations (Detail) $ in Thousands | Dec. 31, 2017 USD ($)
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Contractual Obligation Fiscal Year Maturity Schedule [Line Items] |
Total | $ 602
Less than 1 year | 286
1-3 years | 291
3-5 years | 25
Bothell Office Operating Lease [Member] |
Contractual Obligation Fiscal Year Maturity Schedule [Line Items] |
Total | 95
Less than 1 year | 95
Vancouver Office Operating Lease [Member] |
Contractual Obligation Fiscal Year Maturity Schedule [Line Items] |
Total | 71
Less than 1 year | 71
Seattle Office Operating Lease [Member] |
Contractual Obligation Fiscal Year Maturity Schedule [Line Items] |
Total | 433
Less than 1 year | 117
1-3 years | 291
3-5 years | 25
Leased Equipment [Member] |
Contractual Obligation Fiscal Year Maturity Schedule [Line Items] |
Total | 3
Less than 1 year | $ 3

X
- Definition Contractual obligation fiscal year maturity schedule. + References No definition available. + Details
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Namespace Prefix: | achv_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments. + References No definition available. + Details
Name: | us-gaap_ContractualObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of contractual obligation due in the fourth and fifth fiscal years following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
Name: | us-gaap_ContractualObligationDueInFourthAndFifthYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of contractual obligation due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
Name: | us-gaap_ContractualObligationDueInNextTwelveMonths
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of contractual obligation due in the second and third fiscal years following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_LeaseArrangementTypeAxis=achv_BothellOfficeOperatingLeaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LeaseArrangementTypeAxis=achv_VancouverOfficeOperatingLeaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LeaseArrangementTypeAxis=achv_SeattleOfficeOperatingLeaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LeaseArrangementTypeAxis=achv_LeasedEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |