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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Cash flows from operating activities:    
Net loss $ (10,544) $ (4,439)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 12 3
Share-based compensation 493 35
Deferred tax assets   (19)
Revaluation of convertible preferred stock liability   (437)
Changes in operating assets and liabilities:    
Prepaids and other current assets 109 (82)
Accounts payable 3,066 (427)
Accrued expenses (888) 1,199
Net cash used in operating activities (7,752) (4,167)
Cash flows from investing activities:    
Purchases of property and equipment (61) (2)
Net cash used in investing activities (61) (2)
Cash flows from financing activities:    
Proceeds from issuance of common stock upon exercise of stock options 9  
Net cash provided by financing activities 9  
Net decrease in cash and cash equivalents, and restricted cash (7,804) (4,169)
Cash and cash equivalents, and restricted cash at beginning of period 93,360 11,257
Cash and cash equivalents, and restricted cash at end of period 85,556 7,088
Components of cash and cash equivalents, and restricted cash:    
Cash and cash equivalents 85,532 7,064
Restricted cash 24 24
Cash and cash equivalents, and restricted cash at end of period 85,556 $ 7,088
Noncash investing and financing activities:    
Property and equipment purchases included in accounts payable and accrued expenses $ 54