Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details)

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Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cash flows used in financing activities $ (21,749) $ (8,466)  
Cash and cash equivalents 14,191 11,704  
Restricted cash 5,514 5,002  
Total cash, cash equivalents and restricted cash 19,705 16,706 $ 32,221
Accounting Standards Update 2016-09      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Unrealized excess tax benefits associated with share-based compensation $ 11,200 11,200  
Accounting Standards Update 2016-18 | Effect on prior periods      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cash flows used in financing activities   $ 5,000