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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (45,400) $ (58,897)
Adjustments to reconcile loss to net cash used in operating activities:    
Depreciation and amortization 51 114
Loss on sale of fixed assets   48
Stock-based compensation 10,471 10,376
Amortization of debt discount and debt issuance costs 1,736 7,246
Amortization of intangible asset 485 484
Gain on change in fair value of derivative liabilities   (8,170)
Deferred income taxes   (3,134)
Changes in assets and liabilities:    
Accounts receivable, net (14,625) (3,678)
Inventory (8,043) (788)
Prepaid and other current assets 5,298 (2,589)
Other long-term assets 567 (508)
Accrued interest payable (6,959) (4,730)
Deferred revenue 1,604 1,177
Accounts payable and other current liabilities 23,670 10,149
Other long-term liabilities 448 396
Net cash used in operating activities (30,697) (52,504)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of equipment (12) (21)
Net cash used in investing activities (12) (21)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from issuance of exchangeable debt 30,000  
Payment of debt issuance costs (1,207)  
Proceeds from issuance of common stock, net of transaction costs   64,614
Proceeds from exercise of stock options, net of transaction costs 451 136
Repurchase of exchangeable senior notes (15,107)  
Transaction costs related to exchange of exchangeable senior notes   (678)
Taxes paid related to stock-based awards (2,593) (946)
Net cash provided by financing activities 11,544 63,126
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS (19,165) 10,601
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD 98,251 106,961
CASH AND CASH EQUIVALENTS, END OF PERIOD 79,086 117,562
Cash paid during the year for:    
Interest 12,536 13,839
Income taxes $ 1,186 1,093
Supplemental disclosure of non-cash transactions:    
Exchange of exchangeable senior notes into common stock   $ 128,115