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Related Party Transactions	12 Months Ended
Related Party Transactions	Dec. 31, 2016
Related Party Transactions [Abstract]
Related Party Transactions	D. Related Party Transactions As of December 31, 2016 approximately $1,002,000 was invested in a United States Treasury money market fund which is included in cash and cash equivalents on the accompanying balance sheet. Also, as of December 31, 2016, approximately $2,714,000 was invested in a market neutral mutual fund which is included in marketable securities on the accompanying balance sheet. Amounts invested in the market neutral mutual fund generated $62,000 of investment income that is classified as other income, net on the accompanying consolidated statement of operations. As of December 31, 2015 approximately $4,089,000 was invested in a United States Treasury money market fund. These funds are managed by a related entity (the "Fund Manager") which is related through a common director. One of the Company's directors, who is also a 10% stockholder, currently serves as an executive officer of the Fund Manager. The fund transactions in 2016 and 2015 were directed solely at the discretion of Company management.