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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Cash Flows from Operating Activities:    
Net loss $ (50,777) $ (47,731)
Reconciliation of net loss to net cash used in operating activities:    
Share-based compensation expense 33,695 31,730
Depreciation and amortization 3,352 1,669
Amortization of debt discount 9,283 8,612
Amortization of debt issuance costs 687 655
(Accretion) amortization of discounts/premiums on investments, net (832) 1,064
Change in fair value of restricted equity securities (22,645)  
Other 116 (420)
Change in operating assets and liabilities:    
Accounts receivable (39,117) (11,519)
Inventory (1,154) (3,271)
Other current assets 18 (2,894)
Accounts payable and accrued liabilities 7,739 4,273
Other liabilities 11,310 (175)
Net cash used in operating activities (48,325) (18,007)
Cash Flows from Investing Activities:    
Purchases of available-for-sale debt securities (235,901) (224,076)
Sales and maturities of available-for-sale debt securities 339,740 138,925
Purchase of restricted equity securities (54,720)  
Purchases of property and equipment (8,392) (6,443)
Proceeds from sales of property and equipment 4 30
Net cash provided by (used in) investing activities 40,731 (91,564)
Cash Flows from Financing Activities:    
Issuance of common stock 6,865 22,258
Net cash provided by financing activities 6,865 22,258
Change in cash and cash equivalents and restricted cash (729) (87,313)
Cash and cash equivalents and restricted cash at beginning of period 147,191 259,212
Cash and cash equivalents and restricted cash at end of period 146,462 171,899
Supplemental Disclosure:    
Cash paid for interest 5,822 5,822
Cash paid for income taxes 425  
Non-cash capital expenditures $ 911 $ 3,238