Commitments and Contingencies (Details 3) (Solar photovoltaic systems power purchase agreement, USD $) In Millions, unless otherwise specified	1 Months Ended
Jul. 31, 2014
Solar photovoltaic systems power purchase agreement
Long-term Contract for Purchase of Electric Power [Line Items]
Term of power purchase agreement	25 years
Estimated amount of power to be purchased in 2015	$ 0.7

Estimated amount of electric power expected to be purchased in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

No definition available.

Name:	hwtl_LongTermContractForPurchaseOfElectricPowerEstimatedPurchaseAmountInYearTwo
Namespace Prefix:	hwtl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant