| Dec 31,
2011 | Dec 31,
2012 | Dec 31,
2013 | Dec 31,
2014 | Dec 31,
2015 | Dec 31,
2016 | Dec 31,
2017 | Dec 31,
2018 | Dec 31,
2019 | Dec 31,
2020 | Dec 31,
2021 | Dec 31,
2022 | Dec 31,
2023 |
|---|
| Net income | - | - | - | - | - | - | - | 13 | 17 | 17 | 1 | 42 | 4 |
|---|
| Depreciation | 3 | 3 | 4 | 4 | 4 | 4 | 4 | - | - | - | 8 | 10 | 12 |
|---|
| Amortization | - | - | - | - | - | - | - | - | - | - | 13 | 8 | 9 |
|---|
| Provision for bad debt | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 1 | 2 | 2 |
|---|
| Stock-based compensation | 7 | 5 | 6 | 7 | 7 | 7 | 7 | 9 | 14 | 17 | 39 | 44 | 48 |
|---|
| Amortization of debt issuance costs | - | - | - | - | - | - | 0 | 0 | 0 | 0 | 1 | 3 | 2 |
|---|
| Deferred tax provision | - | - | - | - | - | - | - | - | -1 | -0 | 3 | -4 | -1 |
|---|
| Gain on early extinguishment of debt | - | - | - | - | - | - | - | - | - | - | - | - | 5 |
|---|
| Induced conversion expenses | - | - | - | - | - | - | - | - | - | - | 21 | - | - |
|---|
| Accounts receivable | 2 | -2 | -1 | 2 | 4 | -3 | 8 | 2 | -3 | -0 | 12 | 12 | -19 |
|---|
| Operating lease assets with right of use | - | - | - | - | - | - | - | - | -3 | -3 | -2 | -3 | -2 |
|---|
| Prepaid expenses and other current assets | - | -0 | 1 | 1 | 0 | -0 | 1 | 0 | -1 | 0 | 1 | 0 | 0 |
|---|
| Other assets | 0 | 0 | 0 | 1 | -0 | 0 | -0 | -0 | 0 | -1 | -0 | -0 | 0 |
|---|
| Accounts payable | -1 | -0 | -0 | 0 | -1 | 0 | -1 | 0 | 0 | 1 | -1 | -0 | 2 |
|---|
| Income taxes payable | 3 | 0 | -5 | 5 | -2 | 1 | 3 | -0 | 3 | 1 | 2 | 6 | -5 |
|---|
| Accrued expenses and other current liabilities | 2 | -1 | 0 | -1 | 2 | -1 | -0 | -0 | -1 | 6 | -8 | 2 | -0 |
|---|
| Accrued compensation expenses | -1 | 0 | -0 | 0 | -1 | 0 | 1 | 0 | 0 | 0 | 0 | -3 | -1 |
|---|
| Operating lease liabilities with right of use | - | - | - | - | - | - | - | - | -3 | -3 | -1 | -3 | -3 |
|---|
| Contract liabilities | - | - | - | - | - | - | - | -2 | -1 | -0 | 15 | -2 | -13 |
|---|
| Other liabilities | -1 | -0 | -1 | -0 | -2 | -0 | 3 | -0 | - | 3 | -0 | -3 | - |
|---|
| Net cash provided by operating activities | 16 | 19 | 8 | - | - | - | - | 24 | 39 | 52 | 82 | 91 | 72 |
|---|
| Purchases of property and equipment, and other capitalized assets | - | 4 | 4 | 4 | 4 | 4 | 4 | 6 | 6 | 7 | 13 | 14 | 15 |
|---|
| Purchases of investments | 38 | 21 | 16 | 15 | 8 | 10 | 1 | - | 5 | 0 | 20 | 0 | 78 |
|---|
| Acquisitions of business, net of acquired cash | 2 | 1 | - | - | - | - | - | 0 | - | 174 | 24 | - | - |
|---|
| Net cash used in investing activities | -27 | 3 | 5 | - | - | - | - | 2 | -11 | -176 | -57 | -14 | -93 |
|---|
| Tax withholdings related to net share settlements | - | - | - | - | 2 | 4 | 4 | 3 | 3 | 4 | 0 | 9 | 5 |
|---|
| Purchase of treasury shares and related costs | - | 0 | 48 | 15 | 15 | 8 | 8 | 7 | 7 | 15 | - | 79 | 50 |
|---|
| Proceeds from Stock Options Exercised | - | - | 2 | 5 | 3 | 4 | 1 | 1 | 0 | 1 | - | 0 | 0 |
|---|
| Proceeds from Stock Plans | - | - | - | - | - | - | - | - | - | - | - | 0 | 1 |
|---|
| Registration fees | - | - | - | - | - | - | - | - | - | - | -0 | - | - |
|---|
| Payment of earnout liabilities | - | - | - | - | - | 0 | - | - | - | - | 1 | 5 | 2 |
|---|
| Debt issuance costs | - | - | - | - | - | 0 | 0 | 0 | - | 0 | 11 | - | - |
|---|
| Proceeds from Convertible Debt | - | - | - | - | - | - | - | - | - | 195 | 414 | - | - |
|---|
| Payments for repurchase and conversion of convertible senior notes | - | - | - | - | - | - | - | - | - | - | 147 | - | 43 |
|---|
| Net cash provided by (used in) financing activities | 5 | 1 | -46 | - | - | - | - | -17 | -11 | 153 | 254 | -93 | -98 |
|---|
| Effect of exchange rate changes on cash and cash equivalents | - | - | - | - | - | - | - | -0 | -0 | 0 | -0 | -0 | 1 |
|---|
| Net increase (decrease) in cash and cash equivalents | - | - | - | - | - | - | - | 9 | 18 | 30 | 279 | -17 | -118 |
|---|
| Income Taxes Paid, Net | 4 | 4 | 3 | 0 | 5 | 1 | -0 | 3 | 4 | 5 | 5 | 13 | 18 |
|---|
| Right of use assets and lease liabilities | - | - | - | - | - | - | - | - | - | - | - | 1 | 0 |
|---|