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Related Party Transactions	12 Months Ended
Related Party Transactions	Dec. 31, 2019
Related Party Transactions [Abstract]
Related Party Transactions	13. Related Party Transactions During the year ended December 31, 2018, the Company received $8 million upon issuing convertible promissory notes to several of its existing preferred stock investors. The notes were converted in December 2018 in connection with the Merger. The Company also received gross proceeds of $21.5 million from those same investors from the sale of common stock immediately prior to the Merger. As discussed in Note 1, the Company sold shares of its common stock in December 2019. Roche invested in the Company's December 2019 financing. One of the Company's Board members is affiliated with Roche.