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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Cash flows from operating activities    
Net loss $ (19,369) $ (16,329)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 260 244
Non-cash interest expense and amortization of debt discount and issuance cost 0 3,333
Change in fair value of redeemable convertible preferred stock warrant liability 0 1,705
Change in fair value of derivative instrument 0 764
Stock-based compensation 2,401 749
Accretion of discount on available-for-sale securities (118) 0
Changes in assets and liabilities:    
Prepaid expenses and other current assets (152) (265)
Operating lease right-of-use asset 182 0
Other assets (4,059) 0
Accounts payable 1,342 (1,845)
Accrued and other current liabilities (459) (4,085)
Operating lease liability (185)  
Other liabilities   22
Net cash used in operating activities (20,157) (15,707)
Cash flows from investing activities    
Purchase of property and equipment (126) (38)
Purchase of available-for-sale securities (35,066) 0
Proceeds from maturities of available-for-sale securities 12,000 0
Net cash used in investing activities (23,192) (38)
Cash flows from financing activities    
Proceeds from issuance of convertible notes (includes $9,560 from related parties for the six months ended June 30, 2018)   33,000
Deferred offering costs 0 (768)
Debt issuance cost 0 (140)
Proceeds from issuance of common stock 114 0
Principal payments of capital lease (34) (54)
Principal payments of tenant improvement allowance payable (18) (47)
Net cash provided by financing activities 62 31,991
Net increase (decrease) in cash, cash equivalents and restricted cash (43,287) 16,246
Cash, cash equivalents and restricted cash, at beginning of period 88,394 1,535
Cash, cash equivalents and restricted cash, at end of period 45,107 17,781
Reconciliation of cash, cash equivalents and restricted cash to statement of financial position    
Cash and cash equivalents 44,967 17,641
Restricted cash 140 140
Cash, cash equivalents and restricted cash, at end of period 45,107 17,781
Supplemental disclosures of non-cash investing and financing information:    
Purchase of property and equipment under accounts payable $ 137  
Issuance of derivative instrument related to convertible notes payable   6,603
Unpaid offering costs   1,295
Deferred offering costs paid in restricted stock awards   $ 91