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Commitments and Contingencies - Summary of Contractual Obligations (Detail) $ in Thousands | Mar. 31, 2018 USD ($)
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Contractual Obligation Fiscal Year Maturity Schedule [Line Items] |
Total | $ 470
Less than 1 year | 189
1-3 years | 281
Vancouver Office Operating Lease [Member] |
Contractual Obligation Fiscal Year Maturity Schedule [Line Items] |
Total | 48
Less than 1 year | 48
Seattle Office Operating Lease [Member] |
Contractual Obligation Fiscal Year Maturity Schedule [Line Items] |
Total | 422
Less than 1 year | 141
1-3 years | $ 281

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- 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

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- 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
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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
- Definition Amount of contractual obligation maturing in the remainder of the fiscal year following the latest fiscal year ended. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |