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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash flows from operating activities:      
Net loss $ (58,574,000) $ 130,133,000 $ (120,548,000)
Adjustments to reconcile consolidated net loss to net cash provided by (used in) operating activities:      
Depreciation and amortization 2,934,000 3,654,000 3,683,000
Stock-based compensation 13,274,000 14,218,000 11,696,000
Loss on disposal of property and equipment (707,000) 0 0
Deferred tax benefit 0 (6,014,000) 0
Changes in operating assets and liabilities:      
(Increase) decrease in accounts receivable 53,227,000 (50,608,000) (1,099,000)
Increase in inventories 345,000 437,000 (2,732,000)
(Increase) decrease in prepaid expenses and other current assets (1,948,000) (2,652,000) 1,766,000
(Increase) decrease in other assets 424,000 429,000 144,000
Increase (decrease) in accounts payable and other liabilities (20,969,000) 20,097,000 (19,913,000)
Decrease in deferred revenue 0 (25,990,000) (22,940,000)
Net cash used in operating activities (142,969,000) 113,807,000 (148,607,000)
Cash flows from investing activities:      
Purchases of property and equipment (87,000) (70,000) (95,000)
Proceeds from Sale of Productive Assets 160,385,000 0 0
Proceeds from Sale of Property, Plant, and Equipment 11,013,000    
Purchases of investments (58,555,000) (322,385,000) (119,987,000)
Maturities of investments 268,000,000 166,600,000 289,658,000
Net cash provided by investing activities 380,756,000 (155,855,000) 169,576,000
Cash flows from financing activities:      
Proceeds from issuance of common stock, net of fees 69,970,000 0 732,000
Repurchase of common stock (1,026,000) (941,000) (972,000)
Proceeds from debt borrowings, net of fees 0 0 12,529,000
Repayment of debt borrowings (216,580,000) (1,285,000) (14,533,000)
Net cash provided by (used in) financing activities (147,636,000) (2,226,000) (2,244,000)
Net increase (decrease) in cash and cash equivalents 90,151,000 (44,274,000) 18,725,000
Cash and cash equivalents at beginning of year 36,112,000 80,386,000 61,661,000
Cash and cash equivalents at end of year 126,263,000 36,112,000 80,386,000
Supplemental disclosure of cash flow information:      
Cash paid for interest 17,353,000 19,211,000 16,465,000
Supplemental disclosure of noncash investing and financing activities:      
Common stock, $.001 par value; 225,000 shares authorized; 106,679 and 106,162 shares issued, respectively 15,714,000    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities 3,437,000    
Amortization of debt issuance costs 1,013,000 1,465,000 1,336,000
Gain on sale of non-financial assets (132,585,000) 0 0
Impairment of Real Estate 1,600,000 0 0
Asset Impairment Charges 0 28,638,000 0
Recognition of gain or loss on extinguishment (1,003,000) 0 0
Proceeds from Sale of Buildings $ 11,900,000 $ 0 $ 0