Principal Business Activity and Significant Accounting Policies - Fair value on a contingent consideration (Details) - VIP - Level 3 - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Business Acquisition, Contingent Consideration [Line Items]
Balance at beginning of the period	$ 2,680
Fair value of contingent consideration at VIP Acquisition date		$ 6,900
Change in fair value of contingent consideration	7,320	3,280
Transfer out of level 3	$ (10,000)	(7,500)
Balance at the end of the period		$ 2,680