Quarterly report pursuant to Section 13 or 15(d)

Debt - Interest Expense (Details)

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Debt - Interest Expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Debt Instrument [Line Items]    
Interest expense, net $ 319 $ 707
Amortization of debt discount and debt issuance costs 161 353
Convertible notes    
Debt Instrument [Line Items]    
Interest expense, net 158 354
Amortization of debt discount and debt issuance costs $ 161 $ 353