| Dec 31,
2018 | Dec 31,
2019 | Dec 31,
2020 | Dec 31,
2021 | Dec 31,
2022 | Dec 31,
2023 |
|---|
| Cash and deposits | - | 3,490 | 2,476 | 3,567 | 2,735 | 3,333 |
|---|
| Accounts receivable - trade | - | 83 | 107 | 141 | 169 | 210 |
|---|
| Advance payments to suppliers | - | 139 | 599 | 668 | 1,071 | 1,355 |
|---|
| Prepaid expenses | - | 66 | 57 | 68 | 96 | 110 |
|---|
| Accounts receivable - other | - | 45 | 24 | 68 | 74 | 155 |
|---|
| Other | - | 3 | 56 | 0 | 10 | 0 |
|---|
| Allowance for doubtful accounts | - | -5 | -9 | -10 | -21 | -30 |
|---|
| Current assets | - | 3,821 | 3,311 | 4,502 | 4,134 | 5,133 |
|---|
| Buildings | - | 10 | 10 | 10 | 10 | 11 |
|---|
| Accumulated depreciation | - | -6 | -6 | -7 | -7 | -8 |
|---|
| Buildings, net | - | 4 | 3 | 4 | 3 | 3 |
|---|
| Tools, furniture and fixtures | - | 35 | 15 | 14 | 22 | 21 |
|---|
| Accumulated depreciation | - | -33 | -14 | -12 | -14 | -16 |
|---|
| Tools, furniture and fixtures, net | - | 2 | 1 | 2 | 7 | 4 |
|---|
| Property, plant and equipment | - | 6 | 5 | 5 | 10 | 8 |
|---|
| Software | - | 23 | 79 | 292 | 346 | 382 |
|---|
| Software in progress | - | 131 | 209 | 50 | 68 | 48 |
|---|
| Intangible assets | - | 154 | 288 | 342 | 415 | 430 |
|---|
| Investment securities | - | 2 | 120 | 37 | 28 | 127 |
|---|
| Leasehold and guarantee deposits | - | 19 | 17 | 18 | 18 | 18 |
|---|
| Deferred tax assets | - | 9 | 3 | - | 22 | 0 |
|---|
| Other | - | 5 | 2 | 14 | 17 | 8 |
|---|
| Allowance for doubtful accounts | - | -2 | -2 | -2 | -2 | -4 |
|---|
| Investments and other assets | - | 33 | 140 | 66 | 83 | 148 |
|---|
| Non-current assets | - | 193 | 433 | 414 | 508 | 586 |
|---|
| Assets | - | 4,014 | 3,743 | 4,916 | 4,642 | 5,719 |
|---|
| Accounts payable - trade | - | 5 | 13 | 12 | 19 | 18 |
|---|
| Current portion of long-term borrowings | - | 58 | 54 | 32 | 32 | 6 |
|---|
| Accounts payable - other | - | 98 | 51 | 53 | 84 | 184 |
|---|
| Accrued expenses | - | 32 | 37 | 28 | 38 | 48 |
|---|
| Income taxes payable | - | 1 | 5 | 34 | - | 98 |
|---|
| Accrued consumption taxes | - | 44 | 86 | 81 | 66 | 106 |
|---|
| Contract liabilities | - | - | - | - | 74 | 96 |
|---|
| Advances received | - | 15 | 33 | 33 | 1 | 1 |
|---|
| Deposits received | - | 3,637 | 3,125 | 3,996 | 3,764 | 4,349 |
|---|
| Provision for bonuses | - | - | - | - | - | 8 |
|---|
| Provision for bonuses for directors (and other officers) | - | - | - | - | - | 25 |
|---|
| Other | - | 0 | 0 | 7 | 1 | 4 |
|---|
| Current liabilities | - | 3,890 | 3,405 | 4,276 | 4,081 | 4,943 |
|---|
| Long-term borrowings | - | 125 | 71 | 38 | 6 | - |
|---|
| Asset retirement obligations | - | - | - | - | - | 0 |
|---|
| Non-current liabilities | - | 125 | 71 | 49 | 6 | 0 |
|---|
| Liabilities | - | 4,014 | 3,475 | 4,325 | 4,087 | 4,943 |
|---|
| Share capital | - | 100 | 138 | 222 | 222 | 222 |
|---|
| Legal capital surplus | - | - | 38 | 122 | 122 | 122 |
|---|
| Capital surplus | - | - | 38 | 122 | 122 | 122 |
|---|
| Retained earnings brought forward | - | -100 | 10 | 221 | 192 | 340 |
|---|
| Retained earnings | - | -100 | 10 | 221 | 192 | 340 |
|---|
| Treasury shares | - | - | - | - | -0 | -0 |
|---|
| Shareholders' equity | - | -0 | 186 | 566 | 536 | 684 |
|---|
| Valuation difference on available-for-sale securities | - | - | 82 | 24 | 18 | 86 |
|---|
| Valuation and translation adjustments | - | - | 82 | 24 | 18 | 86 |
|---|
| Share acquisition rights | - | 0 | 0 | 0 | 1 | 5 |
|---|
| Net assets | 129 | 0 | 268 | 590 | 555 | 776 |
|---|
| Liabilities and net assets | - | 4,014 | 3,743 | 4,916 | 4,642 | 5,719 |
|---|