3. Fair Value Measurement (Details) - USD ($) $ in Thousands	Jun. 30, 2015		Dec. 31, 2014
Assets
Money market fund and trust cash sweep investments (1)	$ 45,208		$ 26,297
Total Assets	45,208		26,297
Level 1 Member
Assets
Money market fund and trust cash sweep investments (1)	45,208	[1]	26,297
Total Assets	45,208		26,297
Level 2 Member
Assets
Money market fund and trust cash sweep investments (1)	0		0
Total Assets	0		0
Level 3 Member
Assets
Money market fund and trust cash sweep investments (1)	0		0
Total Assets	$ 0		$ 0

[1] The Company's money market and trust cash sweep investments are included in cash and cash equivalents within the Condensed Consolidated Balance Sheet.