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Stockholders' Equity (Narrative) (Details) $ / shares in Units, $ in Thousands |  |  |  | 1 Months Ended | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 22, 2021 shares | Sep. 20, 2021 item shares | Apr. 18, 2021 shares | Feb. 28, 2022 shares | Mar. 31, 2022 USD ($) $ / shares shares | Mar. 31, 2021 USD ($) $ / shares shares | Dec. 31, 2021 $ / shares shares | Dec. 02, 2020 shares | Aug. 04, 2020 shares
Stockholders' Equity [Line Items] |  |  |  |  |  |  |  |  |
Common Stock Shares Issued |  |  |  |  | 224,329,000 |  | 220,978,000 |  |
Proceeds From Issuance Of Common Stock | $ |  |  |  |  | $ 5,592 | $ 22,343 |  |  |
Common Stock Par Or Stated Value Per Share | $ / shares |  |  |  |  | $ 0.001 |  | $ 0.001 |  |
Omniome Plan [Member] |  |  |  |  |  |  |  |  |
Stockholders' Equity [Line Items] |  |  |  |  |  |  |  |  |
Exchange ratio | item |  | 0.259204639 |  |  |  |  |  |  |
Shares authorized |  | 2,494,128 |  |  |  |  |  |  |
ESPP [Member] |  |  |  |  |  |  |  |  |
Stockholders' Equity [Line Items] |  |  |  |  |  |  |  |  |
Shares issued |  |  |  |  | 1,316,923 | 983,180 |  |  |
Additional common stock reserved for issuance |  |  |  | 4,000,000.0 |  |  |  |  |
Common stock remain available for issuance |  |  |  |  | 10,493,750 |  |  |  |
Stock-based compensation expense | $ |  |  |  |  | $ 3,300 |  |  |  |
2020 Equity Incentive Plan [Member] |  |  |  |  |  |  |  |  |
Stockholders' Equity [Line Items] |  |  |  |  |  |  |  |  |
Shares authorized |  |  |  |  |  |  |  |  | 11,000,000
Common stock remain available for issuance |  |  |  |  | 1,200,000 |  |  |  |
2020 Inducement Equity Incentive Plan [Member] |  |  |  |  |  |  |  |  |
Stockholders' Equity [Line Items] |  |  |  |  |  |  |  |  |
Shares authorized |  |  |  |  |  |  |  | 2,500,000 |
Additional common stock reserved for issuance | 360,000 |  | 750,000 |  |  |  |  |  |
Time-based and performance-based options [Member] |  |  |  |  |  |  |  |  |
Stockholders' Equity [Line Items] |  |  |  |  |  |  |  |  |
Stock-based compensation expense | $ |  |  |  |  | $ 7,500 |  |  |  |
Options to purchase common stock [Member] |  |  |  |  |  |  |  |  |
Stockholders' Equity [Line Items] |  |  |  |  |  |  |  |  |
Weighted average grant date fair value per share | $ / shares |  |  |  |  | $ 6.66 | $ 20.21 |  |  |
RSUs with performance-based vesting [Member] |  |  |  |  |  |  |  |  |
Stockholders' Equity [Line Items] |  |  |  |  |  |  |  |  |
Stock-based compensation expense | $ |  |  |  |  | $ 11,900 |  |  |  |

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