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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Operating activities    
Net loss $ (122,321) $ (106,275)
Depreciation and amortization 568 539
Stock-based compensation expense 8,907 14,031
Amortization of debt issuance costs 1,061 936
Amortization of premium/discount on investments 106 1
Change in fair value of foreign currency derivative 630 532
Receivables 16,724 695
Inventory (6,241) (127)
Prepaid expenses and other assets (1,448) (1,018)
Accounts payable and accrued expenses 6,725 9,975
Interest payable 4,400 1,575
Deferred revenue (1,688) 0
Net cash used in operating activities (92,577) (79,136)
Acquisitions of property and equipment (359) (263)
Purchases of investments (49,818) (3,018)
Sales and maturities of investments 21,907 64,954
Net cash (used in) provided by investing activities (28,270) 61,673
Sale of common stock, net 92,848 0
Sale of pre-funded warrants 14,817 0
Proceeds from senior credit facility 0 19,477
Payment of senior credit facility (5,000) 0
Net proceeds from common stock issued under stock-based compensation plans 1,164 1,161
Net cash provided by financing activities 103,829 20,638
(Decrease) increase in cash, cash equivalents and restricted cash (17,018) 3,175
Cash, cash equivalents and restricted cash at beginning of period 115,723 28,275
Cash, cash equivalents and restricted cash at end of period $ 98,705 $ 31,450