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Organization and Summary of Significant Accounting Policies (Error Correction) (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Aug. 31, 2012
Statements of Operations:                            
Interest expense                 $ 33,060,000 $ 40,680,000 $ 41,362,000 $ 38,779,000 $ 24,778,000  
Total other expense, net                 (42,098,000) (40,268,000) (37,021,000) (37,556,000) (22,792,000)  
Net loss $ 35,123,000 $ (11,284,000) $ (34,838,000) $ (59,223,000) $ (41,568,000) $ (45,542,000) $ (41,389,000) $ (33,245,000) $ (70,222,000) $ (161,744,000) $ (261,297,000) $ (238,192,000) $ (145,335,000)  
Net loss per share, basic and diluted (in dollars per share) $ 0.12 $ (0.04) $ (0.15) $ (0.26) $ (0.18) $ (0.21) $ (0.21) $ (0.17) $ (0.28) $ (0.77) $ (1.34) $ (1.29) $ (0.91)  
Statements of Comprehensive Loss:                            
Comprehensive loss                 $ (70,406,000) $ (161,855,000) $ (261,564,000) $ (237,954,000) $ (145,289,000)  
Statements of Cash Flows:                            
Net loss $ 35,123,000 $ (11,284,000) $ (34,838,000) $ (59,223,000) $ (41,568,000) $ (45,542,000) $ (41,389,000) $ (33,245,000) (70,222,000) (161,744,000) (261,297,000) (238,192,000) (145,335,000)  
Amortization of debt discount and debt issuance costs                 8,432,000 17,041,000 22,289,000 19,722,000 12,442,000  
Balance Sheets:                            
Long-term portion of convertible notes 0       337,937,000       0 337,937,000 223,629,000 301,550,000 291,828,000  
Liabilities 508,223,000       473,148,000       508,223,000 473,148,000 482,592,000 483,452,000 476,015,000  
Additional paid-in capital 2,072,591,000       1,772,123,000       2,072,591,000 1,772,123,000 1,591,782,000 1,504,052,000 1,489,727,000  
Accumulated deficit (1,983,147,000)       (1,912,925,000)       (1,983,147,000) (1,912,925,000) (1,751,181,000) (1,489,884,000) (1,251,692,000)  
Stockholders’ equity (deficit) 89,318,000       (140,806,000)       89,318,000 (140,806,000) (159,324,000) 14,498,000 238,127,000  
Statements of Stockholders’ Equity (Deficit):                            
Net loss 35,123,000 $ (11,284,000) (34,838,000) (59,223,000) (41,568,000) (45,542,000) (41,389,000) (33,245,000) (70,222,000) (161,744,000) (261,297,000) (238,192,000) (145,335,000)  
Additional paid-in capital 2,072,591,000       1,772,123,000       2,072,591,000 1,772,123,000 1,591,782,000 1,504,052,000 1,489,727,000  
Accumulated deficit (1,983,147,000)       (1,912,925,000)       (1,983,147,000) (1,912,925,000) (1,751,181,000) (1,489,884,000) (1,251,692,000)  
Stockholders’ equity (deficit) $ 89,318,000       (140,806,000)       89,318,000 (140,806,000) (159,324,000) 14,498,000 238,127,000  
Restatement Adjustment [Member]                            
Statements of Operations:                            
Net loss     $ 2,200,000 $ 2,100,000 $ 2,100,000 $ 2,000,000 $ 2,000,000 $ 1,900,000            
Net loss per share, basic and diluted (in dollars per share)     $ 0.01 $ 0.01 $ 0.01 $ 0.01 $ 0.01 $ 0.01            
Statements of Cash Flows:                            
Net loss     $ 2,200,000 $ 2,100,000 $ 2,100,000 $ 2,000,000 $ 2,000,000 $ 1,900,000            
Statements of Stockholders’ Equity (Deficit):                            
Net loss     $ 2,200,000 $ 2,100,000 2,100,000 $ 2,000,000 $ 2,000,000 $ 1,900,000            
Restatement Adjustment [Member] | Correction of Amortization of Debt Discount Associated with the 2019 Notes [Member]                            
Statements of Operations:                            
Interest expense                   (7,993,000) (7,245,000) (6,568,000) (2,310,000)  
Total other expense, net                   (7,993,000) (7,245,000) (6,568,000) (2,310,000)  
Net loss                   $ 7,993,000 $ 7,245,000 $ 6,568,000 $ 2,310,000  
Net loss per share, basic and diluted (in dollars per share)                   $ 0.04 $ 0.04 $ 0.04 $ 0.01  
Statements of Comprehensive Loss:                            
Comprehensive loss                   $ 7,993,000 $ 7,245,000 $ 6,568,000 $ 2,310,000  
Statements of Cash Flows:                            
Net loss                   7,993,000 7,245,000 6,568,000 2,310,000  
Amortization of debt discount and debt issuance costs                   (7,993,000) (7,245,000) (6,568,000) (2,310,000)  
Balance Sheets:                            
Accumulated deficit         24,116,000         24,116,000 16,124,000 8,879,000 2,310,000  
Statements of Stockholders’ Equity (Deficit):                            
Net loss                   7,993,000 7,245,000 6,568,000 2,310,000  
Accumulated deficit         24,116,000         24,116,000 16,124,000 8,879,000 2,310,000  
Restatement Adjustment [Member] | Correction of Allocation Between Additional Paid-in Capital and Convertible Notes [Member]                            
Balance Sheets:                            
Long-term portion of convertible notes         36,502,000         36,502,000 44,494,000 51,739,000 58,307,000  
Liabilities         36,502,000         36,502,000 44,494,000 51,739,000 58,307,000  
Additional paid-in capital         (60,618,000)         (60,618,000) (60,618,000) (60,618,000) (60,618,000)  
Statements of Stockholders’ Equity (Deficit):                            
Additional paid-in capital         (60,618,000)         (60,618,000) (60,618,000) (60,618,000) (60,618,000)  
Restatement Adjustment [Member] | Correction of Errors Related with 2019 Notes [Member]                            
Balance Sheets:                            
Stockholders’ equity (deficit)         (36,502,000)         (36,502,000) (44,494,000) (51,739,000) (58,307,000)  
Statements of Stockholders’ Equity (Deficit):                            
Stockholders’ equity (deficit)         $ (36,502,000)         (36,502,000) (44,494,000) $ (51,739,000) $ (58,307,000)  
Senior Subordinated Notes [Member] | 2019 Notes [Member]                            
New Accounting Pronouncement, Early Adoption [Line Items]                            
Debt, principal amount                           $ 287,500,000
Debt, interest rate (as a percent)                           4.25%
Statements of Cash Flows:                            
Amortization of debt discount and debt issuance costs                 $ 7,975,000 $ 11,581,000 $ 10,525,000