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Organization and Summary of Significant Accounting Policies (Error Correction) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Statement of Operations:        
Interest expense $ (4,259) $ (10,451) $ (8,679) $ (20,741)
Total other expense, net (8,876) (9,702) (12,228) (19,790)
Net loss 17,656 $ (34,838) 34,356 $ (94,061)
Net loss per share, basic and diluted (in dollars per share)   $ (0.15)   $ (0.41)
Statements of Comprehensive Loss:        
Comprehensive loss 17,863 $ (34,667) 34,653 $ (93,700)
Statements of Cash Flows:        
Net loss $ 17,656 (34,838) 34,356 (94,061)
Accretion of debt discount and debt issuance costs     $ 182 6,411
Restatement Adjustment [Member] | Correction of Amortization of Debt Discount Associated with the 2019 Notes [Member]        
Statement of Operations:        
Interest expense   2,177   4,301
Total other expense, net   2,177   4,301
Net loss   $ 2,177   $ 4,301
Net loss per share, basic and diluted (in dollars per share)   $ 0.01   $ 0.02
Statements of Comprehensive Loss:        
Comprehensive loss   $ 2,177   $ 4,301
Statements of Cash Flows:        
Net loss   $ 2,177   4,301
Accretion of debt discount and debt issuance costs       $ (4,301)