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Stockholders' Equity - Common Stock and Warrants (Details) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Apr. 13, 2020 USD ($) | Mar. 31, 2019 USD ($) $ / shares shares | Jun. 30, 2019 USD ($) shares | Mar. 31, 2019 $ / shares shares | Jun. 30, 2020 USD ($) item $ / shares shares | Jun. 30, 2019 USD ($) | Dec. 31, 2019 $ / shares shares | Dec. 31, 2017 shares
Stockholders' equity |  |  |  |  |  |  |  |
Preferred stock, Shares authorized |  |  |  |  | 5,000,000.0 |  |  |
Preferred stock, par value | $ / shares |  |  |  |  | $ 0.01 |  |  |
Net proceeds from shares of common stock sold | $ |  | $ 23,500 |  |  | $ (269) | $ 28,265 |  |
Common Stock Shares, Outstanding |  |  |  |  | 306,959,462 |  | 303,378,515 |
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  | $ 0.01 |  | $ 0.01 |
Number of votes per share | item |  |  |  |  | 1 |  |  |
Common stock shares issued |  | 10,000,000 |  |  |  |  |  |
Par value, common stock | $ / shares |  |  |  |  | $ 0.01 |  | 0.01 |
Share price (in dollars per share) | $ / shares |  | $ 2.35 |  | $ 2.35 |  |  |  |
Series A Junior Participating Cumulative Preferred Stock |  |  |  |  |  |  |  |
Stockholders' equity |  |  |  |  |  |  |  |
Preferred stock, par value | $ / shares |  |  |  |  | $ 0.01 |  | $ 0.01 |
Common Stock Shares, Outstanding |  |  |  |  | 0 |  | 0 |
At Market Issuance Sales Agreement |  |  |  |  |  |  |  |
Stockholders' equity |  |  |  |  |  |  |  |
Net proceeds from shares of common stock sold | $ |  |  | $ 5,500 |  |  |  |  |
Common stock shares issued |  |  | 2,100,000 | 0 |  |  |  |
Authorized amount | $ | $ 75,000 |  |  |  |  |  |  |
Warrant Issued With Amazon And Walmart Stores Inc Transaction Agreement In 2017 |  |  |  |  |  |  |  |
Stockholders' equity |  |  |  |  |  |  |  |
Number of warrants exercised (in shares) |  |  |  |  | 33,462,999 |  | 26,188,434 |
Maximum | Warrant Issued With Amazon And Walmart Stores Inc Transaction Agreement In 2017 |  |  |  |  |  |  |  |
Stockholders' equity |  |  |  |  |  |  |  |
Class of Warrant or Right Issued |  |  |  |  |  |  |  | 110,573,392

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