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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Cash Flows from Operating Activities:    
Net income $ 3,012 $ 3,033
Reconciliation of net income to net cash provided by operating activities:    
Share-based compensation expense 53,945 44,800
Depreciation and amortization 5,361 2,749
Amortization of debt discount 14,057 13,040
Amortization of debt issuance costs 1,036 989
Net (accretion of discounts) amortization of premiums on investments (1,466) 1,436
Change in fair value of restricted equity securities 5,805  
Other 792 (482)
Change in operating assets and liabilities:    
Accounts receivable (57,912) (23,436)
Inventory 66 (3,907)
Other current assets (2,180) (2,714)
Accounts payable and accrued liabilities 12,344 15,577
Other liabilities 14,641 (175)
Net cash provided by operating activities 49,501 50,910
Cash Flows from Investing Activities:    
Purchases of available-for-sale debt securities (467,090) (329,289)
Sales and maturities of available-for-sale debt securities 488,823 211,402
Purchase of restricted equity securities (54,720)  
Purchases of property and equipment (11,936) (18,802)
Proceeds from sales of property and equipment 8 30
Net cash used in investing activities (44,915) (136,659)
Cash Flows from Financing Activities:    
Issuance of common stock 20,029 27,748
Net cash provided by financing activities 20,029 27,748
Change in cash and cash equivalents and restricted cash 24,615 (58,001)
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 171,806 201,211
Supplemental Disclosure:    
Cash paid for interest 5,822 5,822
Cash paid for income taxes 507  
Non-cash capital expenditures $ 55 $ 1,802