Acquisitions - Capstone (Details) - Capstone - USD ($) $ in Thousands		3 Months Ended		12 Months Ended
	Apr. 22, 2014	Jun. 30, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Acquisition
Cash consideration	$ 3,000	$ 2,000	$ 500
Acquisition-date fair value of deferred cash consideration paid in 2014	487
Discount of 2014 deferred cash payment	13
Acquisition-date fair value of deferred cash consideration paid in 2015	1,895
Discount of 2015 deferred cash payment	$ 105
Amortization of discount of 2015 deferred cash payment				$ 33	$ 72
Payments of acquisition-related consideration		$ 577		$ 577
Equity consideration (in shares)		18,418		18,418
Fair value of equity consideration		$ 107		$ 107