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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Operating activities    
Net loss $ (37,599) $ (31,054)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 218 176
Stock-based compensation expense 2,754 3,317
Amortization of debt issuance costs 341 255
Amortization of premium/discount on investments 4 (62)
Change in fair value of foreign currency derivative 20 (406)
Deferred revenue (1,053)
Changes in operating assets and liabilities:    
Receivables 16,504 (709)
Prepaid expenses and other assets (847) 1,370
Accounts payable and accrued expenses (5,100) (1,429)
Interest payable 1,477 1,544
Net cash used in operating activities (23,281) (26,998)
Investing activities    
Acquisitions of property and equipment (116) (93)
Purchases of investments (3,018)
Sales and maturities of investments 10,840 18,992
Net cash provided by investing activities 10,724 15,881
Financing activities    
Proceeds from senior credit facility 19,477
Net proceeds from common stock issued under stock-based compensation plans 266 563
Net cash provided by financing activities 266 20,040
Increase (decrease) in cash, cash equivalents and restricted cash (12,291) 8,923
Cash, cash equivalents and restricted cash at beginning of period 115,723 28,275
Cash, cash equivalents and restricted cash at end of period $ 103,432 $ 37,198