Discontinued Operations (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Reclassification of operating results from continuing operations to loss from discontinued operations
Income tax on discontinued operations		$ (10)
Net income from discontinued operations, net of tax		19
ALIGN products
Reclassification of operating results from continuing operations to loss from discontinued operations
Interest income		29
Income tax on discontinued operations		(10)
Net income from discontinued operations, net of tax		$ 19

Amount of tax expense (benefit) related to a discontinued operation. Includes, but is not limited to, tax expense (benefit) related to income (loss) from operations during the phase-out period, tax expense (benefit) related to gain (loss) on disposal, tax expense (benefit) related to gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and tax expense (benefit) related to adjustments of a prior period gain (loss) on disposal.

Amount after tax of income (loss) from a discontinued operation attributable to the parent. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

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