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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Cash Flows From Operating Activities:      
Net loss $ (13,414) $ (42,338)  
Adjustments to reconcile net loss to net cash used in operating activities:      
Share-based compensation expense 2,532 2,902  
Depreciation and amortization of property and equipment 1,551 1,284  
Amortization of patents and other intangible assets 1,486 1,303  
Changes in fair value of earnout, derivative and warrant liabilities (778) (293)  
Amortization of senior debt discounts 1,017 656  
Amortization of short-term investment purchase discounts (68) (131)  
(Gain) loss on sale of equipment (6) 2  
Other adjustments   (71)  
Changes in operating assets and liabilities:      
Accounts receivable (1,076) (6,667)  
Inventories (1,309) (242)  
Other assets 2,276 2,413  
Accounts payable (6,182) (3,957)  
Accrued expenses 2,030 8,957  
Operating lease liabilities (78)    
Net cash used in operating activities (12,019) (36,182)  
Cash Flows From Investing Activities:      
Purchases of short-term investments (9,182) (17,906)  
Sales and maturities of short-term investments 7,258 36,491  
Proceeds from sale of equipment 2    
Capital expenditures (748) (1,028)  
Intangible asset expenditures (57)    
Intangible asset expenditures   3  
Net cash (used in) provided by investing activities (2,727) 17,560  
Cash Flows From Financing Activities:      
Proceeds from the issuance of common stock, net of issuance costs 11 3,892  
Payments made on borrowings (8,301) (684)  
Payments of deferred financing costs (156)    
Payment of payroll taxes withheld for releases of restricted stock units (2)    
Net cash (used in) provided by financing activities (8,448) 3,208  
Decrease in cash and cash equivalents (23,194) (15,414)  
Cash and Cash Equivalents:      
Beginning 46,478 31,969 $ 31,969
Ending 23,284 16,555 $ 46,478
Supplemental Disclosure of Noncash Transactions:      
Acquired equipment under finance lease 406 105  
Finance lease liability from purchase of equipment 406 105  
Supplemental Cash Flow Information:      
Interest paid $ 5,051 $ 6,183