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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 31, 2016
Mar. 31, 2013
Feb. 28, 2013
Mar. 31, 2017
Mar. 31, 2016
Sep. 30, 2014
Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Proceeds from sale of investment in Verinata       $ 0 $ 2,330    
Verinata | Cost-method Investments              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Aggregate disposal value     $ 350,000        
Contingent milestone payment receivable for shareholders in cost method investment     $ 100,000        
Proceeds from sale of investment in Verinata   $ 3,100          
Gain on sale of cost method investment   $ 1,800       $ 300  
Other Assets | Verinata | Cost-method Investments              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Contingent milestone payment receivable for shareholders in cost method investment             $ 2,300
Proceeds from contingent milestone payments $ 2,300