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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Operating Activities:    
Net loss $ (15,343) $ (2,678)
Adjustments to reconcile net loss to net cash used in operating activities:    
Accretion of discount on convertible notes 696 0
Reduction of lease liability (20) 0
Depreciation expense 83 28
Share-based compensation expense 5,382 99
Amortization of premium on short term investments 12 0
Changes in operating assets and liabilities:    
Prepaid expenses (266) (954)
Accounts payable and accrued expenses (2,261) (282)
Accrued research and development costs 116 64
Net cash used in operating activities (11,601) (3,723)
Investing activities:    
Cash acquired in connection with the Reverse Merger 76,348 0
Proceeds from maturities of short-term investments 9,718 0
Proceeds from sale of property and equipment 20 0
Purchases of property and equipment (8) (131)
Net cash provided by (used in) investing activities 86,078 (131)
Financing activities:    
Proceeds from issuance of common stock, net of issuance costs 78,518 0
Proceeds from issuance of convertible preferred stock, net 0 21,549
Net cash provided by financing activities: 78,518 21,549
Net change in cash and restricted cash 152,995 17,695
Cash, cash equivalents and restricted cash at beginning of period 18,349 9,665
Cash, cash equivalents and restricted cash at end of period 171,344 27,360
Supplemental disclosure of non-cash financing activities:    
Conversion of convertible preferred stock into common stock 41,466 0
Supplemental Cash Flow Information [Abstract]    
Cash paid for interest 1,495 0
Cash paid for income taxes $ 0 $ 0