| 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 loss | - | - | - | -29 | -38 | -235 | -216 | -195 | -322 | -318 |
|---|
| Debt issuance costs | - | - | - | - | - | - | - | - | - | 14 |
|---|
| Depreciation and amortization expense | 6 | 7 | 10 | 20 | 33 | 70 | 96 | 108 | 128 | 115 |
|---|
| Stock-based compensation expense | 8 | 12 | 16 | 22 | 31 | 52 | 82 | 98 | 80 | 40 |
|---|
| Operating lease expense | - | - | - | - | - | - | - | - | - | 17 |
|---|
| Restructuring | - | - | - | - | - | - | - | - | - | 1 |
|---|
| Provision for credit losses | - | - | - | - | - | - | - | 8 | 9 | 10 |
|---|
| Impairment charges | - | - | - | - | - | 70 | - | - | 138 | 197 |
|---|
| Loss on debt extinguishment | - | - | - | - | - | - | -12 | -1 | - | -12 |
|---|
| Gain on sale of investment | - | - | - | - | - | - | - | 28 | - | - |
|---|
| Other | - | 0 | - | 1 | 2 | 2 | 1 | 3 | 5 | 1 |
|---|
| Accounts receivable, net | -1 | 1 | 7 | 6 | 18 | -12 | 18 | 32 | 3 | 59 |
|---|
| Other receivables | - | - | - | - | - | - | - | 27 | 1 | -3 |
|---|
| Prepaid expenses and other assets | - | - | - | -2 | 5 | 7 | 28 | 7 | -5 | -14 |
|---|
| Accounts payable and accrued expenses | - | - | - | 4 | 5 | 17 | 11 | 21 | -43 | -0 |
|---|
| Deferred revenue | - | - | - | - | 2 | 10 | 26 | 9 | 5 | -9 |
|---|
| Other liabilities, net | -0 | - | - | 5 | -6 | -29 | -5 | -27 | -42 | -41 |
|---|
| Net cash (used in) provided by operating activities | - | - | - | 8 | -3 | -52 | 30 | -18 | 11 | -3 |
|---|
| Purchase of a business, net of cash acquired | - | - | - | 97 | - | 388 | 1 | 761 | -5 | - |
|---|
| Additions of amortizable intangible assets | - | - | - | 24 | 65 | 65 | 63 | 61 | 62 | 44 |
|---|
| Purchases of property and equipment | - | - | - | - | - | 13 | 7 | 10 | 12 | 6 |
|---|
| Purchase of investments | - | - | - | - | 25 | 10 | - | 1 | - | - |
|---|
| Proceeds from investments | - | - | - | - | - | 25 | - | 39 | - | - |
|---|
| Advances made to university clients | - | - | - | 2 | 0 | 0 | - | - | 0 | - |
|---|
| Advances Repaid From (To) Customers | - | - | - | - | 0 | 0 | 1 | 0 | 0 | 0 |
|---|
| Other | 0 | 2 | 0 | - | - | - | - | - | 0 | - |
|---|
| Net cash used in investing activities | - | - | - | -149 | -102 | -451 | -69 | -793 | -69 | -50 |
|---|
| Proceeds from debt | - | - | - | 4 | - | 245 | 372 | 569 | 1 | 329 |
|---|
| Payments on debt | - | - | - | - | - | - | 251 | - | 7 | 375 |
|---|
| Prepayment premium on extinguishment of senior secured term loan facility | - | - | - | - | - | - | 3 | - | - | 6 |
|---|
| Payment of debt issuance costs | - | - | - | - | - | 2 | 3 | 12 | - | 4 |
|---|
| Tax withholding payments associated with settlement of restricted stock units | - | - | - | 1 | 3 | 3 | 5 | 19 | 3 | 1 |
|---|
| Proceeds from Stock Options Exercised | 2 | 5 | 5 | 7 | 7 | 3 | 4 | 6 | 1 | 0 |
|---|
| Proceeds from employee stock purchase plan share purchases | - | - | - | - | - | - | 4 | 4 | 1 | 2 |
|---|
| Net cash (used in) provided by financing activities | - | - | - | 197 | 333 | 245 | 368 | 545 | -7 | -55 |
|---|
| Effect of exchange rate changes on cash | - | - | - | -1 | -1 | -1 | 1 | -2 | -2 | -1 |
|---|
| Net decrease in cash, cash equivalents and restricted cash | - | - | - | 55 | 226 | -260 | 329 | -269 | -67 | -109 |
|---|