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Condensed Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 5 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2018
Cash flows from operating activities    
Net loss $ (4,986) $ (9,010)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation 1,105 1,631
Depreciation and amortization 3 40
Change in fair value of warrant liability 41 1,057
Changes in operating assets and liabilities:    
Prepaid expenses and other assets (153) (493)
Accounts payable 227 254
Accrued liabilities 113 150
Net cash used in operating activities (3,650) (6,371)
Cash used in investing activities    
Purchases of property and equipment (125) (182)
Cash flows from financing activities    
Proceeds from issuance of redeemable convertible preferred stock, net of issuance costs 18,000
Proceeds from sale of common stock 4
Net cash provided by financing activities 18,004
Change in cash and cash equivalents 14,229 (6,553)
Cash and cash equivalents at beginning of period 13,156
Cash and cash equivalents at end of period 14,229 6,603
Supplemental disclosures of cash flow information    
Cash paid for interest
Cash paid for income taxes
Supplemental disclosures of non-cash investing and financing activities:    
Accrued dividends on redeemable convertible preferred stock 343 900
Deemed dividends for accretion of redeemable convertible preferred stock issuance costs 439 1,257
Common stock warrant liability issued with redeemable convertible preferred stock financing $ 479