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Statements of Cash Flows - USD ($)
$ in Thousands
 8 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Cash flows from operating activities    
Net loss $ (7,156) $ (12,740)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation 1,761 1,850
Depreciation and amortization 13 63
Change in fair value of warrant liability 41 2,583
Changes in operating assets and liabilities:    
Prepaid expenses and other assets (170) (663)
Accounts payable 539 413
Accrued liabilities 254 349
Net cash used in operating activities (4,718) (8,145)
Cash used in investing activities    
Purchases of property and equipment (130) (236)
Cash flows from financing activities    
Proceeds from initial public offering, net of underwriting discounts and commissions 22,803
Payments of initial public offering costs (843)
Proceeds from issuance of redeemable convertible preferred stock, net of issuance costs 18,000
Proceeds from issuance of common stock 4
Net cash provided by financing activities 18,004 21,960
Change in cash and cash equivalents 13,156 13,579
Cash and cash equivalents at beginning of period 13,156
Cash and cash equivalents at end of period 13,156 26,735
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 643 1,048
Deemed dividends for accretion of redeemable convertible preferred stock issuance costs 840 1,694
Common stock warrant liability issued with redeemable convertible preferred stock financing 479
Purchase of equipment included in accounts payable 469
Beneficial conversion feature on redeemable convertible preferred stock 21,747
Reclassification of common stock warrants from liability to additional paid-in-capital $ 3,103