| Mar 31,
2018 | Mar 31,
2019 | Dec 31,
2019 | Dec 31,
2020 | Dec 31,
2021 | Dec 31,
2022 | Dec 31,
2023 |
|---|
| Net loss | - | - | -20 | -35 | -78 | -117 | -101 |
|---|
| Depreciation | - | - | 0 | 0 | 1 | 2 | 2 |
|---|
| Fair Value Adjustment of Warrants | - | - | - | - | 1 | -0 | -0 |
|---|
| Amortization of operating lease right-of-use assets | - | - | - | - | 1 | 3 | 4 |
|---|
| Stock-based compensation | - | - | 1 | 5 | 13 | 19 | 19 |
|---|
| (Accretion) Amortization of (discount) premium on marketable securities | - | - | - | - | -1 | -0 | 1 |
|---|
| Loss on disposal of equipment | - | - | - | -0 | -0 | -0 | -0 |
|---|
| Accounts receivable | - | - | 0 | 1 | 2 | 0 | -2 |
|---|
| Inventory | - | - | -0 | 0 | 0 | 1 | -1 |
|---|
| Prepaid expenses and other current assets | - | - | 1 | 0 | 2 | 1 | -2 |
|---|
| Operating lease right-of-use assets and liabilities, net | - | - | - | - | - | -3 | -1 |
|---|
| Accounts payable, accrued liabilities and deferred revenue | 26,355 | 1 | - | - | - | - | -2 |
|---|
| Accrued compensation | - | - | - | - | - | - | -1 |
|---|
| Net cash used in operating activities | -373,391 | -444,455 | -18 | -29 | -62 | -95 | -77 |
|---|
| Purchases of marketable securities | 145 | - | - | 42 | 48 | 31 | 34 |
|---|
| Maturities and sales of marketable securities | - | - | - | 2 | 37 | - | 65 |
|---|
| Purchases of property and equipment, net | - | - | 0 | 2 | 3 | 3 | 1 |
|---|
| Net cash provided by/(used in) investing activities | -145,187,500 | 137 | -0 | -41 | -13 | -4 | 30 |
|---|
| Proceeds from Issuance of Common Stock | - | - | 20 | - | - | - | 5 |
|---|
| Proceeds from Warrant Exercises | - | - | 0 | 1 | 70 | 0 | - |
|---|
| Proceeds from Stock Options Exercised | - | - | 1 | 0 | 1 | 0 | 0 |
|---|
| Proceeds from Stock Plans | - | - | - | - | 1 | 1 | 1 |
|---|
| Principal repayments of finance lease obligations | - | - | - | 0 | 0 | 0 | 0 |
|---|
| Net cash provided by financing activities | 146 | -136,889,634 | 29 | 79 | 230 | 1 | 6 |
|---|
| Net decrease in cash, cash equivalents and restricted cash | - | - | 11 | 9 | 156 | -99 | -41 |
|---|
| Cash paid for interest on finance lease obligations | - | - | - | 0 | 0 | 0 | 0 |
|---|
| Capital Expenditures Incurred but Not yet Paid | - | - | 1 | 0 | 0 | 0 | - |
|---|
| Right-of-use assets obtained in exchange for lease obligations | - | - | - | - | 9 | 51 | - |
|---|
| Property and equipment acquired under finance leases | - | - | - | 0 | 0 | 0 | - |
|---|
| Change In Unrealized Gain Loss On Available For Sale Marketable Securities | - | - | - | - | -0 | -1 | 1 |
|---|