| 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 loss | -17 | -31 | -41 | -19 | -8 | -9 | -23 | -11 | -12 | -24 | -21 | -34 | -76 |
|---|
| Depreciation | - | - | - | - | - | - | - | 1 | 2 | 2 | 3 | 5 | 6 |
|---|
| Lease, Right-of-Use Asset, Amortization | - | - | - | - | - | - | - | - | 3 | 3 | 3 | 5 | - |
|---|
| Operating Lease, Right-of-Use Asset, Periodic Reduction | - | - | - | - | - | - | - | - | - | - | - | - | 4 |
|---|
| Stock-based compensation | 9 | 5 | 4 | 5 | 5 | 6 | 7 | 8 | 7 | 8 | 12 | 15 | 10 |
|---|
| Provision (recovery) for credit losses | - | - | 0 | - | - | - | - | - | - | - | 0 | 0 | -0 |
|---|
| Equity securities earned from research and development activities from a related party | - | 50 | 7 | 15 | 26 | 31 | 21 | - | - | 1 | 2 | 1 | - |
|---|
| Equity securities earned from research and development activities ($0, ($1,245), and ($1,955) from a related party) | - | - | - | - | - | - | - | - | - | - | - | - | 0 |
|---|
| Unrealized gain on non-marketable securities (($208) and ($983) from a related party) | - | - | - | - | - | - | - | - | - | - | 1 | 0 | - |
|---|
| Other non-cash items | - | - | - | - | - | - | - | - | - | -0 | 0 | 0 | - |
|---|
| Asset impairment and other charges | - | - | - | - | - | - | - | - | - | - | - | - | 10 |
|---|
| Financial assets | - | - | - | - | - | - | - | - | - | 9 | 9 | 3 | -20 |
|---|
| Inventories | 2 | -3 | 0 | -0 | -0 | -0 | 0 | -0 | -0 | 1 | 0 | 1 | 1 |
|---|
| Prepaid expenses and other assets | 1 | 3 | -1 | 0 | -0 | -0 | -0 | 0 | 1 | 1 | 2 | -0 | 1 |
|---|
| Accounts payable | 1 | -7 | 0 | 1 | -1 | 1 | -1 | -1 | -0 | 0 | 0 | 0 | 2 |
|---|
| Increase (Decrease) in Accrued Liabilities | - | - | - | - | - | - | - | - | - | 6 | 7 | 6 | - |
|---|
| Accrued compensation and other accrued liabilities | - | - | - | - | - | - | - | - | - | - | - | - | 14 |
|---|
| Other long-term liabilities | - | - | - | - | - | - | - | -1 | -1 | -3 | -4 | -5 | -5 |
|---|
| Deferred revenue ($0, $0, $245 to a related party) | - | - | - | - | - | - | - | -11 | -6 | 3 | 1 | 25 | -20 |
|---|
| Impairment of investment in non-marketable securities | - | - | - | - | - | - | - | - | - | - | - | - | 12 |
|---|
| Other non-cash items | - | - | - | - | - | - | - | - | - | - | - | - | 0 |
|---|
| Financial assets | - | - | - | - | - | - | - | - | - | 9 | 9 | 3 | -20 |
|---|
| Inventories | 2 | -3 | 0 | -0 | -0 | -0 | 0 | -0 | -0 | 1 | 0 | 1 | 1 |
|---|
| Prepaid expenses and other assets | 1 | 3 | -1 | 0 | -0 | -0 | -0 | 0 | 1 | 1 | 2 | -0 | 1 |
|---|
| Accounts payable | 1 | -7 | 0 | 1 | -1 | 1 | -1 | -1 | -0 | 0 | 0 | 0 | 2 |
|---|
| Increase (Decrease) in Accrued Liabilities | - | - | - | - | - | - | - | - | - | 6 | 7 | 6 | - |
|---|
| Accrued compensation and other accrued liabilities | - | - | - | - | - | - | - | - | - | - | - | - | 14 |
|---|
| Other long-term liabilities | - | - | - | - | - | - | - | -1 | -1 | -3 | -4 | -5 | -5 |
|---|
| Deferred revenue ($0, $0, $245 to a related party) | - | - | - | - | - | - | - | -11 | -6 | 3 | 1 | 25 | -20 |
|---|
| Net cash provided by (used in) operating activities | -0 | -12 | -23 | 0 | -0 | -3 | -9 | -14 | -13 | -16 | -14 | 11 | -53 |
|---|
| Purchase of property and equipment | 11 | 3 | 1 | 0 | 1 | 1 | 1 | 3 | 4 | 4 | 14 | 8 | 4 |
|---|
| Proceeds from sale of property and equipment | - | - | 0 | 0 | 0 | 0 | 0 | 0 | 0 | - | 0 | 0 | 1 |
|---|
| Investment in non-marketable securities ($0, $0, and ($7,630) in a related party) | - | - | - | - | - | - | - | - | - | 2 | 8 | 5 | 1 |
|---|
| Net cash used in investing activities | -49 | 17 | 13 | 5 | -1 | -1 | -1 | -3 | -4 | -6 | -21 | -14 | -5 |
|---|
| Proceeds from Stock Options Exercised | 3 | 1 | 0 | 0 | 0 | 1 | 0 | 5 | 7 | 1 | 5 | 1 | 0 |
|---|
| Proceeds from Issuance of Common Stock | - | - | - | 0 | - | - | 24 | - | 50 | 86 | - | - | 9 |
|---|
| Costs incurred in connection with equity financing | - | - | - | - | - | - | 1 | 0 | 0 | 5 | 0 | 0 | - |
|---|
| Costs incurred in connection with issuance of common stock at public offering | - | - | - | - | - | - | - | - | - | - | - | - | 1 |
|---|
| Payments of lease obligations - Finance leases | - | - | - | - | - | - | - | - | 0 | 0 | - | - | - |
|---|
| Taxes paid related to net share settlement of equity awards | - | - | 0 | 1 | 2 | 2 | 2 | 3 | 3 | 1 | 1 | 1 | 0 |
|---|
| Taxes paid related to net share settlement of equity awards | - | - | 0 | 1 | 2 | 2 | 2 | 3 | 3 | 1 | 1 | 1 | 0 |
|---|
| Net cash provided by (used in) financing activities | 3 | 1 | -0 | -1 | -2 | -0 | 22 | 39 | 54 | 81 | 4 | -1 | 8 |
|---|
| Net cash provided by (used in) financing activities | 3 | 1 | -0 | -1 | -2 | -0 | 22 | 39 | 54 | 81 | 4 | -1 | 8 |
|---|
| Net decrease in cash, cash equivalents and restricted cash | - | - | - | - | - | - | - | 22 | 38 | 59 | -32 | -3 | -49 |
|---|
| Interest paid | - | - | - | - | - | - | - | 0 | 0 | 0 | 0 | 0 | 0 |
|---|
| Income taxes | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
|---|
| Capital expenditures incurred but not yet paid | - | - | - | - | - | - | - | 0 | 0 | 2 | 3 | 1 | 1 |
|---|