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2. Changes to fair value measurement Level 3 (Details) - Liability [Member] - Fair Value, Inputs, Level 3 [Member] - Fair Value, Measurements, Recurring [Member] - Embedded Derivative Liability [Member] $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Fair value beginning balance | $ 0
Issuance of Series A redeemable convertible preferred stock with embedded derivative | 21,232
Remeasurement of Series A redeemable convertible preferred stock embedded derivative to fair value | (3,258)
Fair value ending balance | $ 17,974

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