XML 59 R46.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Commitments and Contingencies - Summary of Contractual Obligations (Detail) $ in Thousands | Sep. 30, 2018 USD ($)
--- | ---
Contractual Obligation Fiscal Year Maturity Schedule [Line Items] |
Total | $ 384
Less than 1 year | 175
1-3 years | 209
Vancouver Office Operating Lease [Member] |
Contractual Obligation Fiscal Year Maturity Schedule [Line Items] |
Total | 32
Less than 1 year | 32
Seattle Office Operating Lease [Member] |
Contractual Obligation Fiscal Year Maturity Schedule [Line Items] |
Total | 352
Less than 1 year | 143
1-3 years | $ 209

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 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
Name: | us-gaap_ContractualObligationDueInSecondAndThirdYear
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_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: |