XML 63 R51.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Commitments and Contingencies - Summary of Contractual Obligations (Detail) $ in Thousands | Sep. 30, 2017 USD ($)
--- | ---
Contractual Obligation Fiscal Year Maturity Schedule [Line Items] |
Total | $ 278
Less than 1 year | 278
Bothell Office Operating Lease [Member] |
Contractual Obligation Fiscal Year Maturity Schedule [Line Items] |
Total | 167
Less than 1 year | 167
Vancouver Office Operating Lease [Member] |
Contractual Obligation Fiscal Year Maturity Schedule [Line Items] |
Total | 98
Less than 1 year | 98
Leased Equipment [Member] |
Contractual Obligation Fiscal Year Maturity Schedule [Line Items] |
Total | 13
Less than 1 year | $ 13

X
- Definition Contractual obligation fiscal year maturity schedule. + References No definition available. + Details
Name: | achv_ContractualObligationFiscalYearMaturityScheduleLineItems
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 maturing in the remainder of the fiscal year following the latest fiscal year ended. + References No definition available. + Details
Name: | us-gaap_ContractualObligationFutureMinimumPaymentsDueRemainderOfFiscalYear
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_LeasedEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |