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Capitalization Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 05, 2018 | Dec. 03, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Nov. 28, 2018
Class of Stock [Line Items] |  |  |  |  |  |
Issuance of common stock, net of issuance costs |  |  | $ (10) | $ 411,385 | $ 0 |
Common stock, shares authorized |  |  | 70,000,000 | 36,000,000 |  |
Document Period End Date |  |  | Dec. 31, 2019 |  |  |
Common stock, par value (usd per share) |  |  | $ 0.001 | $ 0.001 |  |
Common stock, shares issued |  |  | 28,456,508 | 28,404,316 |  |
Common stock, shares outstanding |  |  | 28,456,508 | 28,404,316 |  |
Preferred stock, shares authorized |  |  | 1,000,000 | 1,000,000 |  |
Preferred stock, par value (usd per share) |  |  | $ 0.001 | $ 0.001 |  |
Preferred stock, shares outstanding |  |  | 0 | 0 |  |
Preferred stock, shares issued |  |  | 0 | 0 |  |
Underwritten Public Offering [Member] | Common Stock [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Issuance of common stock, net of issuance costs | $ 53,738 | $ 358,256 |  |  |  |
Common stock, par value (usd per share) |  |  |  |  |  | $ 0.001
Stock Issued During Period, Length of Option to Purchase Overalltement | 30 days |  |  |  |  |
Common stock issued, shares | 1,012,500 | 6,750,000 |  | 7,762,000 |  |

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