XML 41 R29.htm IDEA: XBRL DOCUMENT v3.8.0.1
Fair Value (Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Assets:    
Total assets $ 25,731 $ 26,165
Liabilities:    
Acquisition-related contingent consideration 37,098 37,098
Total liabilities 37,098 37,098
Money Market Funds [Member]    
Assets:    
Total assets 4,087 12,774
Commercial Paper [Member]    
Assets:    
Total assets 11,750 7,472
U.S. Government Agencies and Securities [Member]    
Assets:    
Total assets 1,250 2,999
Corporate Bonds [Member]    
Assets:    
Total assets 5,606 2,920
Asset-backed Securities [Member]    
Assets:    
Total assets 3,038  
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Assets:    
Total assets 1,250 2,999
Liabilities:    
Acquisition-related contingent consideration  
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S. Government Agencies and Securities [Member]    
Assets:    
Total assets 1,250 2,999
Significant Other Observable Inputs (Level 2) [Member]    
Assets:    
Total assets 24,481 23,166
Liabilities:    
Acquisition-related contingent consideration  
Significant Other Observable Inputs (Level 2) [Member] | Money Market Funds [Member]    
Assets:    
Total assets 4,087 12,774
Significant Other Observable Inputs (Level 2) [Member] | Commercial Paper [Member]    
Assets:    
Total assets 11,750 7,472
Significant Other Observable Inputs (Level 2) [Member] | Corporate Bonds [Member]    
Assets:    
Total assets 5,606 2,920
Significant Other Observable Inputs (Level 2) [Member] | Asset-backed Securities [Member]    
Assets:    
Total assets 3,038  
Significant Other Unobservable Inputs (Level 3) [Member]    
Liabilities:    
Acquisition-related contingent consideration 37,098 37,098
Total liabilities $ 37,098 $ 37,098