Fair Value Measurements - Narrative (Details) $ in Thousands	3 Months Ended			9 Months Ended
	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($) Financial_Institution	Dec. 31, 2014 USD ($)	Sep. 30, 2015 USD ($) Financial_Institution	Sep. 30, 2014 USD ($)	Mar. 06, 2015 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Number of financial institutions with certificates of deposit investments | Financial_Institution		2		2
Time deposits, $250,000 or more		$ 250		$ 250
Impairment of property and equipment			$ 800	2,515	$ 276
Property and equipment		3,411	$ 4,808	$ 3,411
Subsequent Event | Disposed of by Sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of property and equipment	$ 300
Proceeds from sale of impaired assets	600
Property and equipment	100
Proceeds from sale of assets	300
Gain on disposition of assets	$ 200
ADA Analytics Israel, LLC
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration, liability						$ 500
Impairment of property and equipment		$ 1,900