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Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Cash flows from operating activities    
Net loss $ (20,141) $ (1,251)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 52  
Stock-based compensation 563  
Amortization of debt discount 199  
Change in fair value of warrant liabilities (95)  
Change in fair value of convertible promissory notes (includes related party amounts of $0 and $14, respectively)   14
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets (includes related party amounts of $0, and $(114), respectively) 6,680 (120)
Accounts payable and accrued expenses (includes related party amounts of $289, and $46, respectively) 1,492 539
Accrued interest (includes related party amounts of $0 and $11, respectively) 81 11
Operating right-of-use asset and lease liabilities (48)  
Other long-term assets (200)  
Net cash used in operating activities (11,417) (807)
Cash flows from investing activities    
Cash paid for property, plant and equipment (676)  
Net cash used in investing activities (676)  
Cash flows from financing activities    
Net proceeds from issuance of long-term debt 25,000  
Net cash provided by financing activities 25,000  
Net increase in cash and cash equivalents 12,907 (807)
Cash and cash equivalents – beginning of period 243,765 879
Cash and cash equivalents – end of period 256,672 $ 72
Supplemental disclosure of cash flow information    
Interest paid 458  
Supplemental disclosure of noncash investing and financing activities    
Property and equipment purchases included in accounts payable and accrued liabilities 20  
Final interest payment fee 2,063  
Lender Warrants    
Supplemental disclosure of noncash investing and financing activities    
Conversion of Lender Warrants into equity $ 318