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Condensed Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Payment for Capped Call $ 10,249,000 $ 0 $ 0
Early Repayment of Senior Debt 56,000,000 0 0
Net loss (66,783,000) (14,642,000) (109,034,000)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:      
Depreciation and amortization 19,065,000 26,268,000 35,063,000
Amortization of Leased Asset 6,565,000 6,990,000 0
Stock-based compensation 29,963,000 37,188,000 40,887,000
Deferred income taxes (50,000) (32,000) (389,000)
Restructuring Costs 5,242,000 199,000 6,282,000
Operating Lease, Impairment Loss 12,460,000 0 0
Amortization of Debt Discount (Premium) 10,366,000 8,987,000 8,112,000
Gain (Loss) on Extinguishment of Debt 5,389,000 0 0
Gain (Loss) on Disposition of Intangible Assets 0 0 (5,000,000)
Other 1,072,000 (1,182,000) 1,696,000
Changes in operating assets and liabilities:      
Accounts receivable, net 93,084,000 (71,269,000) (16,460,000)
Inventory 46,322,000 (27,778,000) 34,093,000
Prepaid expenses and other assets 6,392,000 7,486,000 35,390,000
Accounts payable and other liabilities (87,501,000) 3,210,000 (70,400,000)
Deferred revenue 12,196,000 529,000 (2,674,000)
Net Cash Provided by (Used in) Operating Activities 93,782,000 (24,444,000) (42,434,000)
Investing activities:      
Purchases of property and equipment, net (4,881,000) (8,348,000) (11,004,000)
Purchases of marketable securities 0 (43,636,000) (57,731,000)
Maturities of marketable securities 14,830,000 56,888,000 57,500,000
Sale of marketable securities 0 17,867,000 0
Proceeds from Sale of Intangible Assets 0 0 5,000,000
Payments for (Proceeds from) Other Investing Activities 438,000 0 0
Net cash provided by (used in) investing activities 9,511,000 22,771,000 (6,235,000)
Financing activities:      
Proceeds from issuance of common stock 5,435,000 5,574,000 5,169,000
Payment, Tax Withholding, Share-based Payment Arrangement (6,207,000) (6,618,000) (6,650,000)
Proceeds from Issuance of Debt 143,750,000 0 0
Payments of Debt Issuance Costs (4,752,000) 0 0
Payment for Capped Call 10,249,000 0 0
Early Repayment of Senior Debt (56,000,000) 0 0
Proceeds from Lines of Credit 30,000,000 20,000,000 0
Repayments of Lines of Credit (30,000,000) (20,000,000) 0
Net cash provided by (used in) financing activities 71,977,000 (1,044,000) (1,481,000)
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 2,083,000 923,000 (259,000)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect 177,353,000 (1,794,000) (50,409,000)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 327,654,000 150,301,000 152,095,000
Cash, cash equivalents and restricted cash at beginning of period 150,301,000    
Cash, cash equivalents and restricted cash at end of period 325,654,000 150,301,000  
Interest Paid, Including Capitalized Interest, Operating and Investing Activities 6,717,000 6,179,000 6,125,000
Income Taxes Paid, Net 2,237,000 176,000 (32,090,000)
Capital Expenditures Incurred but Not yet Paid $ 1,030,000 $ 316,000 $ 223,000