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Fair Value Measurements of Assets and Liabilities - Hierarchy (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Dec. 31, 2016
Assets        
Cash and cash equivalents $ 223,138,000   $ 223,138,000 $ 211,433,000
Marketable securities-short term 7,165,000   7,165,000 12,506,000
Marketable securities-long term 1,193,000   1,193,000 2,974,000
Total assets 231,496,000   231,496,000 226,913,000
Liabilities        
Derivative Liability 288,000   288,000  
Contingent consideration obligation 2,831,000   2,831,000 2,833,000
Total liabilities 3,119,000   3,119,000 2,833,000
Temporary Equity        
Redeemable noncontrolling interest 25,280,000   25,280,000 25,280,000
Fair value transfers between levels     0  
Sale of marketable securities 0 $ 0    
Level 1        
Assets        
Cash and cash equivalents 223,138,000   223,138,000 211,433,000
Marketable securities-short term 0   0 0
Marketable securities-long term 0   0 0
Total assets 223,138,000   223,138,000 211,433,000
Liabilities        
Derivative Liability 0   0  
Contingent consideration obligation 0   0 0
Total liabilities 0   0 0
Temporary Equity        
Redeemable noncontrolling interest 0   0 0
Level 2        
Assets        
Cash and cash equivalents 0   0 0
Marketable securities-short term 7,165,000   7,165,000 12,506,000
Marketable securities-long term 1,193,000   1,193,000 2,974,000
Total assets 8,358,000   8,358,000 15,480,000
Liabilities        
Derivative Liability 0   0  
Contingent consideration obligation 0   0 0
Total liabilities 0   0 0
Temporary Equity        
Redeemable noncontrolling interest 0   0 0
Level 3        
Assets        
Cash and cash equivalents 0   0 0
Marketable securities-short term 0   0 0
Marketable securities-long term 0   0 0
Total assets 0   0 0
Liabilities        
Derivative Liability 288,000   288,000  
Contingent consideration obligation 2,831,000   2,831,000 2,833,000
Total liabilities 3,119,000   3,119,000 2,833,000
Temporary Equity        
Redeemable noncontrolling interest $ 25,280,000   25,280,000 $ 25,280,000
Redeemable Noncontrolling Interests        
Temporary Equity        
Fair value adjustment     $ 5,704,000