Fair Value Measurements - Schedule of Reconciliation of All Liabilities Measured at Fair Value Using Level 3 Significant Unobservable Inputs (Detail) - Warrant Liabilities [Member] - USD ($) $ in Thousands	4 Months Ended	8 Months Ended
	May. 05, 2015	Dec. 31, 2015
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 319	$ 290
Change in fair value	(29)
Reclassification to additional paid-in capital as of IPO on May 6, 2015		$ (290)
Ending balance	$ 290