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Balance Sheet Components - At the Market Offering (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 4 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jun. 05, 2020 | Sep. 30, 2020 | Sep. 30, 2020
Class of Stock [Line Items] |  |  |
Net proceeds from "at the market" equity offering |  |  | $ 3,641
At the Market Offering | Common Stock |  |  |
Class of Stock [Line Items] |  |  |
Common stock, par value (USD per share) | $ 0.001 |  |
Maximum aggregate offering price | $ 25,000 |  |
Commission fee (as a percent) | 3.00% |  |
Stock issued in transaction (shares) |  | 1,374,517 |
Net proceeds from "at the market" equity offering |  | $ 3,641 |
Gross proceeds from sale of stock |  | 4,071 |
Commissions and fees |  | 172 |
Other expenses |  | 258 |
Remaining availability under the at the market offering |  | $ 20,929 |

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