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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Cash flows from operating activities    
Net loss $ (67,132) $ (128,860)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 10,442 13,701
Loss on disposals of assets, net 89 1,606
Impairment of goodwill 0 9,635
Impairment of other noncurrent assets 543 13,326
Gain on sale of discontinued operations 0 (672)
Loss on release of cumulative foreign currency translation adjustments to loss from discontinued operations 0 26,957
Unrealized depreciation on equity securities 0 106
Amortization of premiums (discounts) on investments, net 893 (652)
Equity in net loss of affiliates 3 1,163
Stock-based compensation expense 11,462 13,869
Shares issued as payment for services 577 1,006
Provision for credit losses 1,219 759
Accretion of debt discount and amortization of deferred financing costs 8,641 7,807
Deferred income taxes (180) (204)
Other noncash items (4,600) 108
Receivables:    
Trade (5,285) 952
Related parties (47) 265
Other (610) 1,807
Inventory 1,422 5,411
Prepaid expenses and other (388) (1,777)
Other assets 282 (125)
Accounts payable (678) (1,556)
Accrued compensation and benefits (304) (1,605)
Other accrued liabilities 1,505 (3,072)
Deferred revenue 903 (20,304)
Lease liabilities 107 (508)
Related party payables 4 305
Other long-term liabilities (50) 0
Net cash used in operating activities (41,182) (60,552)
Cash flows from investing activities    
Purchases of investments (174,221) (171,360)
Sales and maturities of investments 82,000 96,000
Purchases of property, plant and equipment (4,474) (6,058)
Proceeds from sale of assets 2,537 1,831
Proceeds from sale of discontinued operations, net of cash sold 0 64,240
Proceeds from repayment of notes receivable 3,689 2,942
Net cash used in investing activities (90,469) (12,405)
Cash flows from financing activities    
Proceeds from issuance of shares, net of issuance costs 121,045 35,000
Advances from lines of credit 0 10,005
Repayments of advances from lines of credit 0 (11,927)
Payments of long-term debt (351) (370)
Proceeds from stock option exercises 603 69
Net cash provided by financing activities 121,297 32,777
Effect of exchange rate changes on cash, cash equivalents, and restricted cash 264 (77)
Net decrease in cash, cash equivalents, and restricted cash (10,090) (40,257)
Cash, cash equivalents, and restricted cash    
Beginning of period 52,250 68,434
End of period 42,160 28,177
Supplemental disclosure of cash flow information    
Cash paid during the period for interest 7,116 7,155
Cash paid during the period for income taxes 4 48
Significant noncash activities    
Stock issued upon conversion of long-term debt 0 31,827
Accrued compensation paid in equity awards 0 5,100
Purchases of property and equipment included in accounts payable and other accrued liabilities 108 461
Proceeds from sale of assets included in accounts receivable 124 435
Cash, cash equivalents, and restricted cash    
Cash and cash equivalents 41,728  
Restricted cash included in other assets 432  
Cash, cash equivalents, and restricted cash $ 42,160 $ 28,177