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v3.20.2

Common Stock - Narrative (Details) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 Agreement shares | Jun. 30, 2019 shares | Jun. 30, 2020 shares | Jun. 30, 2019 shares | Dec. 31, 2019 shares
Class Of Stock [Line Items] |  |  |  |  |
Common stock, shares authorized | 200,000,000 |  | 200,000,000 |  | 200,000,000
Common Stock [Member] |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |
Shares issued under sales agency agreements | 621,032 | 361,385 | 736,269 | 422,961 |
Sales Agency Agreement |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |
Number of agreement | Agreement | 4 |  |  |  |
Common stock, shares authorized | 3,200,000 |  | 3,200,000 |  |
Common stock shares authorized under sales agency agreements remaining shares authorized to sell | 2,600,000 |  | 2,600,000 |  |
Sales Agency Agreement | Common Stock [Member] |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |
Shares issued under sales agency agreements | 0.6 |  | 0.6 |  |
Expired Sales Agency Agreements |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |
Shares issued under sales agency agreements |  |  | 0 |  |
Agreement expiration date |  |  | Feb. 29, 2020 |  |

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