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Stockholders' equity (deficit) (Details Narrative) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 3 Months Ended
--- | --- | --- | ---
Feb. 08, 2021 | Mar. 31, 2021 | Feb. 28, 2021 | Nov. 30, 2020 | Mar. 31, 2021
Common Stock [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Shares Issued, Price Per Share |  |  | $ 1.85 |  |
Stock Issued During Period, Shares, New Issues |  |  | 59,500,000 |  | 92,870,000
Proceeds from Stock Plans | $ 47,300 |  | $ 96,600 |  |
Common Stock [Member] | 2020 ATM Program [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Percentage Of Commission Rate Gross Sales Price |  | 3.00% |  |  | 3.00%
Sale of Stock, Number of Shares Issued in Transaction | 28,600,000 |  |  |  |
Public offering of common stock authorized for sale |  |  |  | $ 50,000 |
Common Stock [Member] | 2021 ATM Program [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Percentage Of Commission Rate Gross Sales Price |  |  |  | 3.00% |
Sale of Stock, Price Per Share | $ 1.75 | $ 1.59 |  |  | $ 1.59
Proceeds from Stock Plans |  |  |  |  | $ 7,000
Sale of Stock, Number of Shares Issued in Transaction |  |  |  |  | 4,800,000
Public offering of common stock authorized for sale |  | $ 100,000 |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Number of shares granted |  |  |  |  | 327,000
Weighted average grant date fair value granted |  |  |  |  | $ 1.58
Weighted average vesting life |  |  |  |  | 2 years 1 month 6 days
Number of shares vested |  |  |  |  | 52,000
Weighted average grant date fair value vested |  |  |  |  | $ 1.86
Number of shares vested but not yet settled |  |  |  |  | 732,000
Anticipated Settlement of shares |  |  |  |  | 2021-05
Weighted average grant date fair value |  | $ 1.07 |  |  | $ 1.07
Warrant [Member] | Common Stock [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right |  | 358,000 |  |  | 358,000
Number Of Warrants Or Rights Issued |  | 298,000 |  |  | 298,000
Stock Issued During Period, Shares, New Issues |  | 205,000 |  |  |
Weighted average grant date warrant fair value |  | 563,000 |  |  | 563,000
Weighted average exercise price of warrants |  |  |  |  | $ 0.24
Public offering of common stock authorized for sale |  | $ 50 |  |  |

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