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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Operating activities    
Net loss $ (28,322) $ (19,683)
Reconciliation of net loss to net cash used in operating activities:    
Non-cash items 1,127 1,277
Changes in assets and liabilities:    
Prepaid expenses and other current assets 36 (671)
Other assets 85 (25)
Right-of-use asset-operating 125 (36)
Accounts payable 211 682
Accrued expenses 2,314 (287)
Other liabilities   (56)
Net cash used in operating activities (24,424) (18,799)
Investing activities    
Purchases of short-term investments (42,777) (123,355)
Sales and maturities of short-term investments 69,110 122,777
Purchases of property and equipment (23)  
Net cash provided by (used in) investing activities 26,310 (578)
Financing activities    
Proceeds from public offerings, net of issuance costs 24,559 18,505
Proceeds from at-the-market offering, net of issuance costs 16,270 3,289
Proceeds from exercise of common stock warrants   54
Net cash provided by financing activities 40,829 21,848
Net increase in cash, cash equivalents and restricted cash 42,715 2,471
Cash, cash equivalents and restricted cash, beginning of period 10,376 15,407
Cash, cash equivalents and restricted cash, end of period $ 53,091 17,878
Non-cash financing activities:    
At-the-market offering issuance costs included in current liabilities   $ 65