Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation and Accounting Policy Information (Details)

v3.10.0.1
Basis of Presentation and Accounting Policy Information (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Mar. 31, 2018
Sep. 30, 2017
Mar. 31, 2017
Sep. 30, 2016
Error Corrections and Prior Period Adjustments Restatement [Line Items]          
Total cash, cash equivalents, and restricted cash shown in the statement of cash flows $ 30,891 $ 36,327 $ 85,180 $ 44,293 $ 85,180
Increase in income taxes receivable   $ 2,000      
Cash and Cash Equivalents          
Error Corrections and Prior Period Adjustments Restatement [Line Items]          
Total cash, cash equivalents, and restricted cash shown in the statement of cash flows 28,481       83,378
Prepaid Expenses and Other Current Assets          
Error Corrections and Prior Period Adjustments Restatement [Line Items]          
Total cash, cash equivalents, and restricted cash shown in the statement of cash flows 1,759       1,324
Other Assets          
Error Corrections and Prior Period Adjustments Restatement [Line Items]          
Total cash, cash equivalents, and restricted cash shown in the statement of cash flows $ 651       $ 478