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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Operating Activities    
Net loss $ (67,604) $ (37,334)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation expense 2,722 2,707
Depreciation and amortization 175 93
Changes in operating assets and liabilities:    
Accounts receivable 2,199 13,445
Prepaid and other assets (2,028) 225
Accounts payable (2,063) (35)
Accrued compensation and other accrued liabilities 1,473 2,156
Operating lease liability and right-of-use asset 177 45
Deferred revenue (1,130) (14,236)
Net cash flows used in operating activities (66,079) (32,934)
Investing Activities    
Proceeds from maturities of short-term investments 46,162 74,082
Purchase of short-term investments   (91,742)
Purchases of property and equipment (839) (228)
Net cash flows provided by (used in) investing activities 45,323 (17,888)
Financing Activities    
Issuance of common stock for public offering, net of issuance costs 49,250 59,941
Issuance of common stock from stock grants and option exercises 303 435
Net cash flow provided by financing activities 49,553 60,376
Net increase in cash and cash equivalents 28,797 9,554
Cash and cash equivalents at beginning of the period 30,360 15,369
Cash and cash equivalents at end of the period 59,157 $ 24,923
Supplemental Disclosure of Non-Cash Investing and Financing Activities:    
Right-of-use assets obtained in exchange for operating lease liabilities $ 1,850