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Shareholders' Equity (Shareholders' Equity) (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 16, 2020 | Dec. 16, 2020 | Dec. 15, 2020 | Dec. 15, 2020 | Dec. 14, 2020 | Dec. 07, 2020 | Jun. 05, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Stockholders' Equity Note [Abstract] |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized |  |  |  |  |  |  |  | 50,000,000 | 50,000,000
Preferred stock, par value |  |  |  |  |  |  |  | $ 0.001 | $ 0.001
Preferred stock, shares issued |  |  |  |  |  |  |  | 0 | 0
Common stock, shares authorized |  |  |  |  |  |  |  | 250,000,000 | 250,000,000
Common stock, par value |  |  |  |  |  |  | $ 0.001 | $ 0.001 | $ 0.001
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |
Common stock, par value |  |  |  |  |  |  | $ 0.001 | $ 0.001 | $ 0.001
Common stock, shares reserved for future issuance |  |  |  |  |  |  |  | 19,683,333 |
2006 Plan, number of shares available for grant |  |  |  |  |  |  |  | 1,566,811 |
Equity Offering, Excluding Underwriter's Option |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |
Stock issued in transaction (shares) |  |  |  |  | 4,900,000 |  |  |  |
Underwriter's Option |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |
Stock issued in transaction (shares) | 735,000 |  |  |  |  |  |  |  |
Sale of stock, agreement term | 30 days |  |  |  |  |  |  |  |
Equity Offering |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |
Stock issued in transaction (shares) |  | 5,635,000 |  |  |  |  |  |  |
Sale of stock, price per share (USD per share) | $ 2.45 | $ 2.45 |  |  |  |  |  |  |
Net proceeds from transaction |  | $ 12,743 |  |  |  |  |  |  |
Private Placement |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |
Stock issued in transaction (shares) |  |  | 2,475,712 |  |  | 724,288 |  |  |
Sale of stock, price per share (USD per share) |  |  | $ 2.071 | $ 2.071 |  | $ 2.071 |  |  |
Net proceeds from transaction |  |  |  | $ 6,210 |  |  |  |  |
At the Market Offering |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |
Stock issued in transaction (shares) |  |  |  |  |  |  |  | 1,747,466 |
Net proceeds from transaction |  |  |  |  |  |  |  | $ 4,429 |
Maximum aggregate offering price |  |  |  |  |  |  | $ 25,000 |  |
Commissions and fees |  |  |  |  |  |  | 3.00% |  |

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