Quarterly report pursuant to Section 13 or 15(d)

Net Loss Per Share (Details)

v3.8.0.1
Net Loss Per Share (Details) - USD ($)
 1 Months Ended 3 Months Ended 12 Months Ended
Mar. 27, 2018
Jul. 27, 2017
Jul. 27, 2016
Mar. 31, 2017
Aug. 31, 2016
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2016
Mar. 08, 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           $ (38,284,000) $ (125,611,000)      
Weighted average shares outstanding – basic and diluted           90,792,000 85,440,000      
Net loss per share – basic and diluted (in dollars per share)           $ (0.42) $ (1.47)      
Proceeds from Issuance of Debt $ 143,000,000                  
Common stock, par value (usd per share)           $ 0.0001       $ 0.0001
Common Stock | UMG Recordings - share price threshold | 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)             500,000 500,000.0    
Common Stock | UMG Recordings - share price threshold | 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)             400,000 400,000.0    
Common Stock | UMG Recordings                    
Schedule of Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]                    
Shares issued in period (in shares)         1,800,000          
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)       500,000 500,000.0          
Share Price (in usd per share)       $ 10.00 $ 10   $ 10.00 $ 10    
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)       400,000 400,000.0          
Share Price (in usd per share)       $ 12.00 $ 12   $ 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)           6,240,000 6,602,000      
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)           2,194,000 1,581,000      
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 1,072,000      
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)           2,143,000 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      
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 4,834,000      
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      
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)           803,000 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)           578,000 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        
Exercise price (in usd per share)           $ 1.57        
Public SPAC 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     6,173,228      
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        
Exercise price (in usd per share)           $ 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