XML 40 R29.htm IDEA: XBRL DOCUMENT
v3.20.2

Account Receivable, Contract Assets, and Contract Liabilities (Tables) | 6 Months Ended
--- | ---
Oct. 31, 2020
Account Receivable Contract Assets And Contract Liabilities |
Schedule of Accounts Receivable, Contract Assets and Contract Liabilities | The following provides further details on the balance sheet accounts of accounts receivable, contract assets, and contract liabilities from contracts with customers:
|  | October 31, 2020 |  |  | April 30, 2020 |
|  | (in thousands) |
Accounts receivables |  | $ | - |  |  | $ | 105 |
Contract assets |  |  | 97 |  |  |  | 251 |
Contract liabilities |  |  | 109 |  |  |  | 165 |
Schedule of Significant Changes in Contract assets and Contract Liabilities | Significant changes in the contract assets balances during the period are as follows:
|  | Six months ended |
|  | October 31, 2020 |
|  | (in thousands) |
Transferred to receivables from contract assets recognized at the beginning of the period |  | $ | (251 | )
Revenue recognized and not billed as of the end of the period |  |  | 97 |
Net change in contract assets |  | $ | (154 | )
Significant changes in the contract liabilities balances during the period are as follows:
|  | Six months ended |
|  | October 31, 2020 |
|  | (in thousands) |
Revenue recognized that was included in the contract liabilities balance as of the beginning of the period |  | $ | 49 |
Transferred to contract assets from contract liabilities recognized at the beginning of the period |  |  | 7 |
Net change in contract liabilities |  | $ | 56 |

X
- References No definition available. + Details
Name: | OPTT_AccountReceivableContractAssetsAndContractLiabilitiesAbstract
Namespace Prefix: | OPTT_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Schedule of Accounts Receivable,Contract Assets , And Contract Liabilities. + References No definition available. + Details
Name: | OPTT_ScheduleOfAccountsReceivableContractAssetsAndContractLiabilitiesTableTextBlock
Namespace Prefix: | OPTT_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130551-203045 + Details
Name: | us-gaap_ContractWithCustomerAssetAndLiabilityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration