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Balance Sheet Information - Summary of Changes in Warranty Liability (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Accounting Policies [Abstract]
Beginning balance	$ 4,685	$ 2,498
Accrual for warranty expense	785	2,105
Warranty costs incurred during the period	(655)htwr_WarrantyCost	(341)htwr_WarrantyCost
Ending balance	$ 4,815	$ 4,262

Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers. For classified balance sheets, represents the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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