Share-Based Compensation-Plan Info (Details Textuals 2) (2005 Employee Stock Purchase Plan [Member])	Mar. 31, 2013
2005 Employee Stock Purchase Plan [Member]
Stock Purchase Plan Activity
Purchase price of common stock under Employee stock purchase plan as a percentage of fair market value of share	85.00%

Purchase price of common stock under Employee stock purchase plan as a percentage of fair market value of share.

No definition available.

Name:	sndk_PurchasePriceOfCommonStockUnderEmployeeStockPurchasePlanAsPercentageOfFairMarketValueOfShare
Namespace Prefix:	sndk_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant