Consolidated Balance Sheet Detail - Summary of Accrued Expenses and Other Current Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Mar. 31, 2018
Payables And Accruals [Abstract]
Accrued legal and professional fees	$ 1,263	$ 280
Accrued interest	3,077	4,612
Goods received not invoiced	1,900	1,272
Accrued capital expenditure	984	3,309
Other accrued expenses	3,166	5,867
Total accrued expenses and other current liabilities	$ 10,390	$ 15,340