| 2011年
12月31日 | 2012年
12月31日 | 2013年
12月31日 | 2014年
12月31日 | 2015年
12月31日 | 2016年
12月31日 | 2017年
12月31日 | 2018年
12月31日 | 2019年
12月31日 | 2020年
12月31日 | 2021年
12月31日 | 2022年
12月31日 | 2023年
12月31日 |
|---|
| Cash and cash equivalents | 3 | 2 | 3 | 3 | 18 | 18 | 14 | 19 | 26 | 38 | 29 | 20 | 27 |
|---|
| Marketable securities | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | - | - | - | 5 | 5 |
|---|
| Accounts receivable, net | 3 | 3 | 2 | 2 | 1 | 1 | 1 | 4 | 9 | 3 | 6 | 13 | 8 |
|---|
| Other current assets | 0 | 0 | 0 | 1 | 3 | 1 | 2 | 1 | 1 | 1 | 2 | 4 | 5 |
|---|
| Total current assets | 7 | 7 | 8 | 6 | 24 | 21 | 18 | 25 | 36 | 42 | 37 | 42 | 44 |
|---|
| Investments | 1 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 3 | 2 | 6 | 5 | 4 |
|---|
| us-gaap_PropertyPlantAndEquipmentNet | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 7 | 10 | 12 | 11 |
|---|
| Other long-term assets | - | - | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 3 | 4 | 4 | 4 |
|---|
| Total assets | 10 | 10 | 11 | 9 | 26 | 23 | 22 | 29 | 44 | 57 | 58 | 63 | 64 |
|---|
| Accounts payable | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 3 | 2 | 2 |
|---|
| us-gaap_DeferredRevenueCurrent | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 1 | 1 | 1 | 2 | 1 | 2 |
|---|
| Accrued payroll | 0 | 1 | 1 | 1 | 0 | 1 | 1 | 1 | 3 | 2 | 2 | 2 | 2 |
|---|
| Accrued expenses | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 |
|---|
| Income tax payable | - | - | - | - | - | - | - | 0 | 1 | 1 | 1 | - | - |
|---|
| Other current liabilities | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 1 | 5 | 2 | 2 | 3 |
|---|
| Other current liabilities | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 1 | 5 | 2 | 2 | 3 |
|---|
| Total current liabilities | 3 | 3 | 3 | 2 | 3 | 4 | 2 | 3 | 6 | 10 | 11 | 8 | 10 |
|---|
| Total current liabilities | 3 | 3 | 3 | 2 | 3 | 4 | 2 | 3 | 6 | 10 | 11 | 8 | 10 |
|---|
| Deferred revenue, net of current portion | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | - | 0 | 0 | 0 |
|---|
| Deferred revenue, net of current portion | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | - | 0 | 0 | 0 |
|---|
| Deferred tax liability | - | - | - | - | - | - | - | - | 0 | 1 | 1 | 1 | - |
|---|
| Deferred tax liability | - | - | - | - | - | - | - | - | 0 | 1 | 1 | 1 | - |
|---|
| Long-term lease obligation | - | - | - | - | - | - | - | - | 0 | 2 | 3 | 2 | 1 |
|---|
| Long-term lease obligation | - | - | - | - | - | - | - | - | 0 | 2 | 3 | 2 | 1 |
|---|
| Other long-term liabilities | 0 | 0 | 0 | 0 | 0 | 0 | - | - | - | - | - | - | 0 |
|---|
| Total noncurrent liabilities | - | - | - | - | - | - | - | - | 1 | 3 | 3 | 3 | 2 |
|---|
| Common stock, $0.01 par value: Authorized shares - 20,000,000; Issued shares – 9,016,140 and 9,010,119 at December 31, 2023 and 2022, respectively; Outstanding shares – 8,295,408 and 8,502,735 at December 31, 2023 and 2022, respectively | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
|---|
| Additional paid-in capital | 21 | 21 | 21 | 22 | 21 | 18 | 15 | 15 | 15 | 16 | 16 | 16 | 17 |
|---|
| Treasury stock, 507,384 and 311,496 shares as of December 31, 2022 and 2021, respectively, at cost | - | - | - | - | - | - | - | - | - | 2 | 11 | 17 | - |
|---|
| Treasury stock, 720,732 and 507,384 shares as of December 31, 2023 and 2022, respectively, at cost | - | - | - | - | - | - | - | - | - | - | - | - | 20 |
|---|
| Accumulated other comprehensive loss | -0 | -0 | -0 | -0 | -0 | -0 | -0 | -0 | -0 | -0 | -0 | -0 | 0 |
|---|
| Accumulated income | -16 | -14 | -13 | -13 | 5 | 4 | 5 | 11 | 22 | 30 | 39 | 53 | 56 |
|---|
| Total stockholders’ equity | 7 | 8 | 9 | 9 | 26 | 22 | 19 | 26 | 37 | 44 | 44 | 53 | 53 |
|---|
| Total liabilities and stockholders’ equity | 10 | 10 | 11 | 9 | 26 | 23 | 22 | 29 | 44 | 57 | 58 | 63 | 64 |
|---|