Acquisitions - Narrative (Details) - USD ($) $ in Thousands	1 Months Ended
	Feb. 28, 2018	Dec. 31, 2016	May 31, 2016	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Goodwill		$ 51,036		$ 60,979	$ 51,036
Twine Health, Inc. [Member]
Business Acquisition [Line Items]
Cash paid for acquisition	$ 16,700
Goodwill	9,900
Deferred tax liabilities	1,700
Deferred revenue	200
Assumed liabilities	600
Consideration held as security for indemnifications obligations	2,600
Twine Health, Inc. [Member] | In process research and development [Member]
Business Acquisition [Line Items]
Intangibles acquired	$ 5,400
Amortization period	4 years
Twine Health, Inc. [Member] | Customer relationships [Member]
Business Acquisition [Line Items]
Intangibles acquired	$ 3,800
Amortization period	7 years
Pebble Industries, Inc [Member]
Business Acquisition [Line Items]
Cash paid for acquisition		23,400
Goodwill					14,400
Assumed liabilities					600
Consideration held as security for indemnifications obligations		$ 3,500
Pebble Industries, Inc [Member] | In process research and development [Member]
Business Acquisition [Line Items]
Intangibles acquired					9,600
Amortization period		5 years
Vector Watch S.R.L. [Member]
Business Acquisition [Line Items]
Cash paid for acquisition		$ 15,000
Goodwill					11,400
Assumed liabilities					300
Consideration held as security for indemnifications obligations		$ 2,300
Vector Watch S.R.L. [Member] | In process research and development [Member]
Business Acquisition [Line Items]
Intangibles acquired					$ 3,900
Amortization period		2 years 6 months
Coin, Inc [Member]
Business Acquisition [Line Items]
Cash paid for acquisition			$ 7,000
Goodwill			3,100
Consideration held as security for indemnifications obligations			1,400
Coin, Inc [Member] | In process research and development [Member]
Business Acquisition [Line Items]
Intangibles acquired			$ 3,900