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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Operating Activities:    
Net loss $ (72,559) $ (36,827)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:    
Depreciation and amortization 1,583 1,207
Amortization of discount on marketable securities (2,455) (1,656)
Gain on free shares (551) 0
Stock-based compensation 9,390 6,564
Net loss on lease termination 218 0
Other 11 465
Net changes in operating assets and liabilities:    
Interest receivable (391) (322)
Accounts receivable (7,422) (1,634)
Prepaid expenses and other assets (5,449) (3,564)
Operating lease right-of-use assets 1,923 0
Accounts payable and accrued liabilities 1,811 2,733
Accrued compensation and employee benefits (764) (1,133)
Deferred revenues (10,821) 138,474
Long-term portion of lease liabilities (563) 0
Other non-current liabilities 1,327 0
Net cash (used in) provided by operating activities (84,712) 104,307
Investing Activities:    
Purchases of marketable securities (244,306) (451,240)
Maturities of marketable securities 226,884 133,297
Purchases of property and equipment (9,760) (5,768)
Net cash used in investing activities (27,182) (323,711)
Financing Activities:    
Proceeds from public offering of common stock, net of issuance costs 136,308 215,756
Taxes paid related to net share settlement of equity awards (296) (57)
Proceeds from issuance of common stock 4,094 13,285
Net cash provided by financing activities 140,106 228,984
Effects of changes in foreign exchange rates 592 0
Net increase in cash, cash equivalents, and restricted cash 28,804 9,580
Cash, cash equivalents, and restricted cash, beginning of period 143,918 53,326
Cash, cash equivalents, and restricted cash, end of period 172,722 62,906
Supplemental disclosure of non-cash activities:    
Property and equipment included in accrued liabilities 1,679 1,836
Right-of-use assets obtained in exchange for lease obligations $ 29,671 $ 0