Quarterly report pursuant to Section 13 or 15(d)

Net Loss Per Share (Details)

v3.10.0.1
Net Loss Per Share (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Mar. 27, 2018
Jul. 27, 2017
Jul. 27, 2016
Mar. 31, 2017
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Mar. 08, 2018
Jan. 30, 2018
Dec. 31, 2017
Schedule of Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]                      
Net loss – basic and diluted         $ (43,228,000) $ (52,968,000) $ (127,423,000) $ (222,708,000)      
Weighted average shares outstanding – basic and diluted         91,408,000 89,194,000 91,101,000 86,710,000      
Net loss per share – basic and diluted (in dollars per share)         $ (0.47) $ (0.59) $ (1.40) $ (2.57)      
Common stock, par value (usd per share)         $ 0.0001   $ 0.0001       $ 0.0001
Common Stock | UMG Recordings | Price Per Share Scenario One                      
Schedule of Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]                      
Shares issued in period (in shares)       500,000              
Share Price (in usd per share)           10.00   10.00      
Common Stock | UMG Recordings | Price Per Share Scenario Two                      
Schedule of Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]                      
Shares issued in period (in shares)       400,000              
Share Price (in usd per share)           $ 12.00   $ 12.00      
Emerging Markets Communications LLC                      
Schedule of Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]                      
Deferred compensation to be paid     $ 25,000,000                
Common stock issued for acquisition (in shares)   5,080,049                  
Employee stock options                      
Schedule of Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]                      
Antidilutive securities excluded from computation of net income (loss) per share (in shares)         6,149,000 5,686,000 5,993,000 6,133,000      
Restricted stock units (including performance stock units)                      
Schedule of Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]                      
Antidilutive securities excluded from computation of net income (loss) per share (in shares)         1,387,000 1,143,000 2,793,000 1,458,000      
Equity warrants                      
Schedule of Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]                      
Antidilutive securities excluded from computation of net income (loss) per share (in shares)         0 0 0 471,000      
Public SPAC Warrants                      
Schedule of Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]                      
Antidilutive securities excluded from computation of net income (loss) per share (in shares)         0 6,173,000 707,000 6,173,000      
2.75% convertible senior notes due 2035                      
Schedule of Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]                      
Antidilutive securities excluded from computation of net income (loss) per share (in shares)         4,447,000 4,447,000 4,447,000 4,447,000      
EMC deferred consideration                      
Schedule of Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]                      
Antidilutive securities excluded from computation of net income (loss) per share (in shares)         0 1,439,000 0 3,737,000      
Contingently issuable shares                      
Schedule of Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]                      
Antidilutive securities excluded from computation of net income (loss) per share (in shares)         900,000 900,000 900,000 900,000      
Penny Warrants                      
Schedule of Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]                      
Antidilutive securities excluded from computation of net income (loss) per share (in shares)         18,066,000 0 12,375,000 0      
Market Warrants                      
Schedule of Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]                      
Antidilutive securities excluded from computation of net income (loss) per share (in shares)         13,000,000 0 8,905,000 0      
Market Warrants                      
Schedule of Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]                      
Number of warrants (in shares)         13,000,000   13,000,000        
Exercise price (in usd per share)         $ 1.57   $ 1.57        
Penny Warrants                      
Schedule of Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]                      
Number of warrants (in shares)         18,065,775   18,065,775        
Exercise price (in usd per share)         $ 0.01   $ 0.01        
Subordinated Debt                      
Schedule of Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]                      
Proceeds from issuance of debt $ 150,000,000                    
Equity warrants                      
Schedule of Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]                      
Proceeds from issuance of debt $ 150,000,000                    
Equity warrants | Market Warrants                      
Schedule of Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]                      
Number of securities called by warrants 13,000,000               13,000,000    
Exercise price (in usd per share) $ 1.57               $ 1.57    
Equity warrants | Penny Warrants                      
Schedule of Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]                      
Number of securities called by warrants 18,065,775               18,065,775    
Common stock, par value (usd per share) $ 0.0001                    
Exercise price (in usd per share) $ 0.01               $ 0.01    
Public SPAC Warrants | Public Warrants | Quotes prices in active markets (Level 1)                      
Schedule of Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]                      
Number of warrants (in shares)                   6,173,228