Sale of the Services Business, Discontinued Operations - Depreciation, Capital Expenditures, and Significant Operating and Investing Non-Cash Items Related to Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Stock-based compensation	$ 274	$ 296
Changes in deferred rent	$ 0	(57)
Services Business [Member] | Discontinued Operations, Held-for-sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Depreciation expense		282
Purchases of property and equipment		(171)
Stock-based compensation		33
Changes in deferred rent		(57)
Equipment purchases in accounts payable and accrued expenses		$ 25