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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Cash flows from operating activities    
Net loss $ (38,700) $ (41,924)
Adjustments to reconcile net loss to net cash used in operating activities:    
Non-cash other income/expense, net (15) (3)
Non-cash interest income 3 28
Non-cash interest expense 218 371
Loss on extinguishment of debt 2,757  
Depreciation and amortization expense 209 245
Amortization of right-of-use assets 171 211
Stock-based compensation 3,103 3,728
Other, net 39 (20)
Changes in operating assets and liabilities:    
Increase in long-term receivables 10 (282)
Increase in accounts receivable, net and other receivables and prepaid expenses (3,247) 470
Increase in inventory (4,514)  
Increase/(decrease) in accounts payable (1,950) (346)
Decrease in accrued expenses and other liabilities (3,427) (4,106)
Increase/(decrease) in other non-current liabilities 4 (52)
Increase/(decrease) in income tax liabilities (33) 10
Net cash used in operating activities (45,372) (41,670)
Cash flows from investing activities    
Purchases of plant and equipment and intangible assets (85) (57)
Changes in restricted cash (163)  
Net cash used in investing activities (248) (57)
Cash flows from financing activities    
Proceeds from equity offerings and warrants 38,414  
Proceeds from at-the-market facility 3,688 13,592
Proceeds from long-term debt, net of issuance costs   80
Proceeds from employee stock purchase plan 43 170
Repayments of long-term borrowings (30,000)  
Equity transaction costs (2,977) (414)
Net cash provided by financing activities 9,168 13,428
Effects of foreign currency translation on cash and cash equivalents (70) 40
Net decrease in cash, cash equivalents and restricted cash (36,522) (28,259)
Cash, cash equivalents and restricted cash at beginning of period 86,411 102,003
Cash, cash equivalents and restricted cash at end of period 49,889 73,744
Supplemental disclosure of cash flow information:    
Interest paid 1,147 1,109
Equity transaction costs included in accounts payable and accrued expenses $ 319 $ 498