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Stockholders' Equity (Narrative) (Details) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended | 18 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 14, 2020 | Aug. 31, 2020 USD ($) $ / shares shares | Jan. 31, 2020 shares | Sep. 30, 2020 USD ($) item $ / shares shares | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) $ / shares | Mar. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) item $ / shares shares | Sep. 30, 2019 USD ($) shares | Dec. 31, 2019 $ / shares shares | Sep. 30, 2020 USD ($) item $ / shares shares | Aug. 04, 2020 shares | Jun. 30, 2020 USD ($)
Stockholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value | $ / shares |  |  |  | $ 0.001 |  | $ 0.001 |  | $ 0.001 |  | $ 0.001 | $ 0.001 |  |
Proceeds from issuance of common stock from underwritten public equity offering, net of issuance costs | $ |  |  |  |  |  |  |  | $ 93,788 |  |  |  |  |
Continuation Advances | $ |  |  |  |  | $ 34,000 | $ 18,000 | $ 52,000 | $ 34,000 |  |  |  |  |
Period in which company must repay continuation advances if change-of-control transaction is entered into with third party |  |  |  |  |  |  |  | 2 years |  |  |  |  |
Equity or debt financing that must be raised in a single transaction | $ |  |  |  |  |  |  |  | $ 100,000 |  |  |  |  |
Number of equity compensation plans | item |  |  |  | 3 |  |  |  | 3 |  |  | 3 |  |
Stock-based compensation | $ |  |  |  |  |  |  |  | $ 12,258 | $ 12,532 |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued |  |  |  | 22,345,000 |  |  |  | 22,345,000 |  |  |  |  |
2010 Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Additional common stock reserved for issuance |  |  | 7,700,000 |  |  |  |  |  |  |  |  |  |
2010 Director Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Additional common stock reserved for issuance |  |  | 1,500,000 |  |  |  |  |  |  |  |  |  |
ESPP [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued |  |  |  |  |  |  |  | 834,677 | 1,306,329 |  |  |  |
Additional common stock reserved for issuance |  |  | 3,100,000 |  |  |  |  |  |  |  |  |  |
Common stock reserved for issuance |  |  |  | 5,878,770 |  |  |  | 5,878,770 |  |  | 5,878,770 |  |
Stock-based compensation | $ |  |  |  | $ 1,800 |  |  |  | $ 2,300 |  |  |  |  |
Employee stock purchase rights offered |  |  |  |  |  |  |  |  |  |  | 0 |  |
2020 Equity Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Shares authorized |  |  |  |  |  |  |  |  |  |  |  | 11,000,000 |
Common stock reserved for issuance |  |  |  | 7,900,000 |  |  |  | 7,900,000 |  |  | 7,900,000 |  |
Shelf Registration Statement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of common stock, preferred stock, depositiry shares, warrants, units or debt securities available in future public offerings | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 250,000
Access to capital makets, period | 3 years |  |  |  |  |  |  |  |  |  |  |  |
Underwriting Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Public offering |  | 19,430,000 |  |  |  |  |  |  |  |  |  |  |
Common stock, par value | $ / shares |  | $ 0.001 |  |  |  |  |  |  |  |  |  |  |
Common stock offering price per share | $ / shares |  | $ 4.47 |  |  |  |  |  |  |  |  |  |  |
Public offering, option to purchase additionl shares, period |  | 30 days |  |  |  |  |  |  |  |  |  |  |
Public offering, option to purchase additional shares, shares |  | 2,914,500 |  |  |  |  |  |  |  |  |  |  |
Shares issued |  | 22,300,000 |  |  |  |  |  |  |  |  |  |  |
Commissions, percentage of gross proceeds |  | 6.00% |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock from underwritten public equity offering, net of issuance costs | $ |  | $ 93,900 |  |  |  |  |  |  |  |  |  |  |
Offering costs | $ |  | $ 300 |  | $ 200 |  |  |  | $ 200 |  |  | $ 200 |  |
Stock Options [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation | $ |  |  |  | 1,400 |  |  |  | 4,200 |  |  |  |  |
Options granted |  |  |  |  |  |  |  |  |  | 0 |  |  |
Time-Based Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation | $ |  |  |  | 1,700 |  |  |  | 5,500 |  |  |  |  |
Performance-Based Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation | $ |  |  |  | $ 0 |  |  |  | $ 0 |  |  |  |  |

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