XML 51 R36.htm IDEA: XBRL DOCUMENT
v3.19.1

Reverse Merger - Summary of Final Purchase Price (Detail) - OncoGenex Pharmaceuticals, Inc [Member] $ / shares in Units, $ in Thousands | Aug. 01, 2017 USD ($) $ / shares shares
--- | ---
Business Acquisition [Line Items] |
Shares of the combined company to be owned by OncoGenex equity holders | shares | 273,670
Multiplied by the price per share of OncoGenex stock | $ / shares | $ 46.20
Value of shares of the combined company owned by OncoGenex equity holders | $ 12,643
Fair value of options and warrants assumed | 207
Fair value of contingent value rights assumed | 200
Total purchase price | $ 13,050

X
- Definition Business combination share owned by acquiree equity holders. + References No definition available. + Details
Name: | achv_BusinessCombinationShareOwnedByAcquireeEquityHolders
Namespace Prefix: | achv_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Business combination value of share owned by acquiree equity holders. + References No definition available. + Details
Name: | achv_BusinessCombinationValueOfShareOwnedByAcquireeEquityHolders
Namespace Prefix: | achv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value of contingent value rights assumed. + References No definition available. + Details
Name: | achv_FairValueOfContingentValueRightsAssumed
Namespace Prefix: | achv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value of options and warrants assumed. + References No definition available. + Details
Name: | achv_FairValueOfOptionsAndWarrantsAssumed
Namespace Prefix: | achv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_BusinessAcquisitionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
Name: | us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Price of a single share of a number of saleable stocks of a company. + References No definition available. + Details
Name: | us-gaap_SharePrice
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=achv_OncoGenexPharmaceuticalsIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |