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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Operating activities:    
Net loss $ (63,683) $ (62,325)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation expense 6,388 7,298
Non-cash interest expense 822 5,159
Depreciation and amortization 745 814
Changes in operating assets and liabilities:    
Receivables (27,997) 19,405
Inventory 377 (745)
Prepaid expenses and other assets 5,633 1,881
Accounts payable and accrued expenses 9,869 (18,225)
Net cash used in operating activities (67,846) (46,738)
Investing activities:    
Purchases of property and equipment (100) (210)
Purchases of investments (4) (3,188)
Proceeds from the sale and maturities of investments 63,500 46,768
Net cash provided by investing activities 63,396 43,370
Financing activities:    
Proceeds upon exercise of stock options and warrants 7,468 2,778
At the market offering costs (241)  
Payments on finance lease obligations (576) (530)
Net cash provided by financing activities 6,651 2,248
Net (decrease) increase in cash and cash equivalents 2,201 (1,120)
Cash and cash equivalents at beginning of period 10,501 3,084
Cash and cash equivalents at end of period 12,702 1,964
Supplemental cash flow information    
Cash paid for interest 9,012 6,721
Property acquired under finance lease $ 39 $ 44