Business Combinations Stone Temple (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	Jul. 16, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Business Acquisition [Line Items]
Adjustment to fair value of contingent consideration for purchase of business		$ 116	$ 121	$ (308)	$ 1,091
Stone Temple Consulting Corporation
Business Acquisition [Line Items]
Date of acquisition	Jul. 16, 2018
Total purchase price	$ 12,300
Cash paid for acquisition	9,900
Common stock issued	1,100
Net working capital settlement	100
Initial fair value estimate of additional earnings-based contingent consideration	$ 1,200
Contingent consideration, maximum cash payout		2,600		2,600
Fair value of contingent consideration		0		0
Adjustment to fair value of contingent consideration for purchase of business				(1,300)
Tax deductible amount of Goodwill		$ 5,400		$ 5,400