Debt - Schedule of Long-Term Debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Mar. 31, 2016
Debt Disclosure [Abstract]
Total debt	$ 84,000	$ 30,000
Less current portion		(1,000)
Long-term debt	84,000	29,000
Fee due on final repayment of facility		1,350
Deferred debt costs, net of amortization	(3,937)	(1,534)
Fair value of associated share warrant, net of amortization		(906)
Long-term debt, less current portion	$ 80,063	$ 27,910