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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Operating activities    
Net loss $ (82,385) $ (78,402)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 3,196 1,658
Amortization of right-of-use assets 2,046  
Accretion of discounts on marketable securities (875) (681)
Stock compensation expense 15,519 11,089
Cost of sales - amortization of intangible assets 4,570 4,715
Non-cash interest expense 2,135 1,139
Changes in operating assets and liabilities:    
Accounts and other receivables, net (3,878) (450)
Inventories, net (17,607) (4,800)
Prepaid expenses and other current assets (643) (186)
Other assets 3,177 (834)
Accounts payable 2,817 1,623
Lease liabilities (761)  
Accrued liabilities and other liabilities (3,574) 1,330
Net cash used in operating activities (76,263) (63,799)
Investing activities    
Acquisition of technology licenses (7,000) (9,500)
Purchases of marketable securities (108,341) (186,821)
Proceeds from maturities of marketable securities 99,310 165,450
Purchases of property and equipment, net (11,383) (1,639)
Net cash used in investing activities (27,414) (32,510)
Financing activities    
Proceeds from long-term debt, net 74,250 99,000
Proceeds from issuance of common stock, net 13,949  
Proceeds (tax withholding) from exercise of stock options and restricted stock awards, net 1 (549)
Proceeds from Employee Stock Purchase Plan 407 255
Net cash provided by financing activities 88,607 98,706
Effect of exchange rate changes on cash, cash equivalents and restricted cash (44) (260)
Net (decrease) increase in cash, cash equivalents and restricted cash (15,114) 2,137
Cash, cash equivalents and restricted cash at beginning of period 49,967 27,213
Cash, cash equivalents and restricted cash at end of period 34,853 29,350
Supplemental disclosure of cash flow information    
Cash paid during the period for interest 5,300 2,713
Tenant improvements provided by the landlord 3,228  
Non-cash investing and financing activities:    
Disposal of fully depreciated property and equipment 981 42
Non-cash acquisition of technology license   12,773
Purchases of property and equipment, not yet paid 6,920 $ 327
Right-of-use assets obtained in exchange for operating lease liabilities $ 34,807