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Related Party Transactions	12 Months Ended
Related Party Transactions	Dec. 31, 2017
Related Party Transactions [Abstract]
Related Party Transactions	D. Related Party Transactions As of December 31, 2017 approximately $11,050,000 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, 2017, approximately $3,792,000 was invested in a market neutral mutual fund which is included in marketable securities on the accompanying consolidated balance sheets. Amounts invested in the market neutral mutual fund generated $24,000 of investment income during 2017 that is classified as other income, net on the accompanying consolidated statement of operations. 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 consolidated balance sheets, and $2,714,000 was invested in a market neutral mutual fund which is included in marketable securities on the accompanying consolidated balance sheets. These funds are managed by a related entity (the "Fund Manager") which is related through a common director who is also a 10% stockholder, and currently serves as an executive officer of the Fund Manager. The fund transactions in 2017 and 2016 were directed solely at the discretion of the Company’s management.